publishFullContrib: true for ydb

<HIDDEN_URL>
commit_hash:c82a80ac4594723cebf2c7387dec9c60217f603e

14 files changed, 6115 insertions, 0 deletions

diff --git a/contrib/go/_std_1.22/src/encoding/gob/debug.go b/contrib/go/_std_1.22/src/encoding/gob/debug.go
new file mode 100644
index 0000000000..a6b1a74f2f
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/debug.go
@@ -0,0 +1,731 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Delete the next line to include in the gob package.
+//
+//go:build ignore
+
+package gob
+
+// This file is not normally included in the gob package. Used only for debugging the package itself.
+// Except for reading uints, it is an implementation of a reader that is independent of
+// the one implemented by Decoder.
+// To enable the Debug function, delete the +build ignore line above and do
+//	go install
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"sync"
+)
+
+var dumpBytes = false // If true, print the remaining bytes in the input buffer at each item.
+
+// Init installs the debugging facility. If this file is not compiled in the
+// package, the tests in codec_test.go are no-ops.
+func init() {
+	debugFunc = Debug
+}
+
+var (
+	blanks = bytes.Repeat([]byte{' '}, 3*10)
+	empty  = []byte(": <empty>\n")
+	tabs   = strings.Repeat("\t", 100)
+)
+
+// tab indents itself when printed.
+type tab int
+
+func (t tab) String() string {
+	n := int(t)
+	if n > len(tabs) {
+		n = len(tabs)
+	}
+	return tabs[0:n]
+}
+
+func (t tab) print() {
+	fmt.Fprint(os.Stderr, t)
+}
+
+// A peekReader wraps an io.Reader, allowing one to peek ahead to see
+// what's coming without stealing the data from the client of the Reader.
+type peekReader struct {
+	r    io.Reader
+	data []byte // read-ahead data
+}
+
+// newPeekReader returns a peekReader that wraps r.
+func newPeekReader(r io.Reader) *peekReader {
+	return &peekReader{r: r}
+}
+
+// Read is the usual method. It will first take data that has been read ahead.
+func (p *peekReader) Read(b []byte) (n int, err error) {
+	if len(p.data) == 0 {
+		return p.r.Read(b)
+	}
+	// Satisfy what's possible from the read-ahead data.
+	n = copy(b, p.data)
+	// Move data down to beginning of slice, to avoid endless growth
+	copy(p.data, p.data[n:])
+	p.data = p.data[:len(p.data)-n]
+	return
+}
+
+// peek returns as many bytes as possible from the unread
+// portion of the stream, up to the length of b.
+func (p *peekReader) peek(b []byte) (n int, err error) {
+	if len(p.data) > 0 {
+		n = copy(b, p.data)
+		if n == len(b) {
+			return
+		}
+		b = b[n:]
+	}
+	if len(b) == 0 {
+		return
+	}
+	m, e := io.ReadFull(p.r, b)
+	if m > 0 {
+		p.data = append(p.data, b[:m]...)
+	}
+	n += m
+	if e == io.ErrUnexpectedEOF {
+		// That means m > 0 but we reached EOF. If we got data
+		// we won't complain about not being able to peek enough.
+		if n > 0 {
+			e = nil
+		} else {
+			e = io.EOF
+		}
+	}
+	return n, e
+}
+
+type debugger struct {
+	mutex          sync.Mutex
+	remain         int  // the number of bytes known to remain in the input
+	remainingKnown bool // the value of 'remain' is valid
+	r              *peekReader
+	wireType       map[typeId]*wireType
+	tmp            []byte // scratch space for decoding uints.
+}
+
+// dump prints the next nBytes of the input.
+// It arranges to print the output aligned from call to
+// call, to make it easy to see what has been consumed.
+func (deb *debugger) dump(format string, args ...any) {
+	if !dumpBytes {
+		return
+	}
+	fmt.Fprintf(os.Stderr, format+" ", args...)
+	if !deb.remainingKnown {
+		return
+	}
+	if deb.remain < 0 {
+		fmt.Fprintf(os.Stderr, "remaining byte count is negative! %d\n", deb.remain)
+		return
+	}
+	data := make([]byte, deb.remain)
+	n, _ := deb.r.peek(data)
+	if n == 0 {
+		os.Stderr.Write(empty)
+		return
+	}
+	b := new(bytes.Buffer)
+	fmt.Fprintf(b, "[%d]{\n", deb.remain)
+	// Blanks until first byte
+	lineLength := 0
+	if n := len(data); n%10 != 0 {
+		lineLength = 10 - n%10
+		fmt.Fprintf(b, "\t%s", blanks[:lineLength*3])
+	}
+	// 10 bytes per line
+	for len(data) > 0 {
+		if lineLength == 0 {
+			fmt.Fprint(b, "\t")
+		}
+		m := 10 - lineLength
+		lineLength = 0
+		if m > len(data) {
+			m = len(data)
+		}
+		fmt.Fprintf(b, "% x\n", data[:m])
+		data = data[m:]
+	}
+	fmt.Fprint(b, "}\n")
+	os.Stderr.Write(b.Bytes())
+}
+
+// Debug prints a human-readable representation of the gob data read from r.
+// It is a no-op unless debugging was enabled when the package was built.
+func Debug(r io.Reader) {
+	err := debug(r)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "gob debug: %s\n", err)
+	}
+}
+
+// debug implements Debug, but catches panics and returns
+// them as errors to be printed by Debug.
+func debug(r io.Reader) (err error) {
+	defer catchError(&err)
+	fmt.Fprintln(os.Stderr, "Start of debugging")
+	deb := &debugger{
+		r:        newPeekReader(r),
+		wireType: make(map[typeId]*wireType),
+		tmp:      make([]byte, 16),
+	}
+	if b, ok := r.(*bytes.Buffer); ok {
+		deb.remain = b.Len()
+		deb.remainingKnown = true
+	}
+	deb.gobStream()
+	return
+}
+
+// note that we've consumed some bytes
+func (deb *debugger) consumed(n int) {
+	if deb.remainingKnown {
+		deb.remain -= n
+	}
+}
+
+// int64 decodes and returns the next integer, which must be present.
+// Don't call this if you could be at EOF.
+func (deb *debugger) int64() int64 {
+	return toInt(deb.uint64())
+}
+
+// uint64 returns and decodes the next unsigned integer, which must be present.
+// Don't call this if you could be at EOF.
+// TODO: handle errors better.
+func (deb *debugger) uint64() uint64 {
+	n, w, err := decodeUintReader(deb.r, deb.tmp)
+	if err != nil {
+		errorf("debug: read error: %s", err)
+	}
+	deb.consumed(w)
+	return n
+}
+
+// GobStream:
+//
+//	DelimitedMessage* (until EOF)
+func (deb *debugger) gobStream() {
+	// Make sure we're single-threaded through here.
+	deb.mutex.Lock()
+	defer deb.mutex.Unlock()
+
+	for deb.delimitedMessage(0) {
+	}
+}
+
+// DelimitedMessage:
+//
+//	uint(lengthOfMessage) Message
+func (deb *debugger) delimitedMessage(indent tab) bool {
+	for {
+		n := deb.loadBlock(true)
+		if n < 0 {
+			return false
+		}
+		deb.dump("Delimited message of length %d", n)
+		deb.message(indent)
+	}
+	return true
+}
+
+// loadBlock preps us to read a message
+// of the length specified next in the input. It returns
+// the length of the block. The argument tells whether
+// an EOF is acceptable now. If it is and one is found,
+// the return value is negative.
+func (deb *debugger) loadBlock(eofOK bool) int {
+	n64, w, err := decodeUintReader(deb.r, deb.tmp) // deb.uint64 will error at EOF
+	if err != nil {
+		if eofOK && err == io.EOF {
+			return -1
+		}
+		errorf("debug: unexpected error: %s", err)
+	}
+	deb.consumed(w)
+	n := int(n64)
+	if n < 0 {
+		errorf("huge value for message length: %d", n64)
+	}
+	return int(n)
+}
+
+// Message:
+//
+//	TypeSequence TypedValue
+//
+// TypeSequence
+//
+//	(TypeDefinition DelimitedTypeDefinition*)?
+//
+// DelimitedTypeDefinition:
+//
+//	uint(lengthOfTypeDefinition) TypeDefinition
+//
+// TypedValue:
+//
+//	int(typeId) Value
+func (deb *debugger) message(indent tab) bool {
+	for {
+		// Convert the uint64 to a signed integer typeId
+		uid := deb.int64()
+		id := typeId(uid)
+		deb.dump("type id=%d", id)
+		if id < 0 {
+			deb.typeDefinition(indent, -id)
+			n := deb.loadBlock(false)
+			deb.dump("Message of length %d", n)
+			continue
+		} else {
+			deb.value(indent, id)
+			break
+		}
+	}
+	return true
+}
+
+// Helper methods to make it easy to scan a type descriptor.
+
+// common returns the CommonType at the input point.
+func (deb *debugger) common() CommonType {
+	fieldNum := -1
+	name := ""
+	id := typeId(0)
+	for {
+		delta := deb.delta(-1)
+		if delta == 0 {
+			break
+		}
+		fieldNum += delta
+		switch fieldNum {
+		case 0:
+			name = deb.string()
+		case 1:
+			// Id typeId
+			id = deb.typeId()
+		default:
+			errorf("corrupted CommonType, delta is %d fieldNum is %d", delta, fieldNum)
+		}
+	}
+	return CommonType{name, id}
+}
+
+// uint returns the unsigned int at the input point, as a uint (not uint64).
+func (deb *debugger) uint() uint {
+	return uint(deb.uint64())
+}
+
+// int returns the signed int at the input point, as an int (not int64).
+func (deb *debugger) int() int {
+	return int(deb.int64())
+}
+
+// typeId returns the type id at the input point.
+func (deb *debugger) typeId() typeId {
+	return typeId(deb.int64())
+}
+
+// string returns the string at the input point.
+func (deb *debugger) string() string {
+	x := int(deb.uint64())
+	b := make([]byte, x)
+	nb, _ := deb.r.Read(b)
+	if nb != x {
+		errorf("corrupted type")
+	}
+	deb.consumed(nb)
+	return string(b)
+}
+
+// delta returns the field delta at the input point. The expect argument,
+// if non-negative, identifies what the value should be.
+func (deb *debugger) delta(expect int) int {
+	delta := int(deb.uint64())
+	if delta < 0 || (expect >= 0 && delta != expect) {
+		errorf("decode: corrupted type: delta %d expected %d", delta, expect)
+	}
+	return delta
+}
+
+// TypeDefinition:
+//
+//	[int(-typeId) (already read)] encodingOfWireType
+func (deb *debugger) typeDefinition(indent tab, id typeId) {
+	deb.dump("type definition for id %d", id)
+	// Encoding is of a wireType. Decode the structure as usual
+	fieldNum := -1
+	wire := new(wireType)
+	// A wireType defines a single field.
+	delta := deb.delta(-1)
+	fieldNum += delta
+	switch fieldNum {
+	case 0: // array type, one field of {{Common}, elem, length}
+		// Field number 0 is CommonType
+		deb.delta(1)
+		com := deb.common()
+		// Field number 1 is type Id of elem
+		deb.delta(1)
+		id := deb.typeId()
+		// Field number 3 is length
+		deb.delta(1)
+		length := deb.int()
+		wire.ArrayT = &arrayType{com, id, length}
+
+	case 1: // slice type, one field of {{Common}, elem}
+		// Field number 0 is CommonType
+		deb.delta(1)
+		com := deb.common()
+		// Field number 1 is type Id of elem
+		deb.delta(1)
+		id := deb.typeId()
+		wire.SliceT = &sliceType{com, id}
+
+	case 2: // struct type, one field of {{Common}, []fieldType}
+		// Field number 0 is CommonType
+		deb.delta(1)
+		com := deb.common()
+		// Field number 1 is slice of FieldType
+		deb.delta(1)
+		numField := int(deb.uint())
+		field := make([]*fieldType, numField)
+		for i := 0; i < numField; i++ {
+			field[i] = new(fieldType)
+			deb.delta(1) // field 0 of fieldType: name
+			field[i].Name = deb.string()
+			deb.delta(1) // field 1 of fieldType: id
+			field[i].Id = deb.typeId()
+			deb.delta(0) // end of fieldType
+		}
+		wire.StructT = &structType{com, field}
+
+	case 3: // map type, one field of {{Common}, key, elem}
+		// Field number 0 is CommonType
+		deb.delta(1)
+		com := deb.common()
+		// Field number 1 is type Id of key
+		deb.delta(1)
+		keyId := deb.typeId()
+		// Field number 2 is type Id of elem
+		deb.delta(1)
+		elemId := deb.typeId()
+		wire.MapT = &mapType{com, keyId, elemId}
+	case 4: // GobEncoder type, one field of {{Common}}
+		// Field number 0 is CommonType
+		deb.delta(1)
+		com := deb.common()
+		wire.GobEncoderT = &gobEncoderType{com}
+	case 5: // BinaryMarshaler type, one field of {{Common}}
+		// Field number 0 is CommonType
+		deb.delta(1)
+		com := deb.common()
+		wire.BinaryMarshalerT = &gobEncoderType{com}
+	case 6: // TextMarshaler type, one field of {{Common}}
+		// Field number 0 is CommonType
+		deb.delta(1)
+		com := deb.common()
+		wire.TextMarshalerT = &gobEncoderType{com}
+	default:
+		errorf("bad field in type %d", fieldNum)
+	}
+	deb.printWireType(indent, wire)
+	deb.delta(0) // end inner type (arrayType, etc.)
+	deb.delta(0) // end wireType
+	// Remember we've seen this type.
+	deb.wireType[id] = wire
+}
+
+// Value:
+//
+//	SingletonValue | StructValue
+func (deb *debugger) value(indent tab, id typeId) {
+	wire, ok := deb.wireType[id]
+	if ok && wire.StructT != nil {
+		deb.structValue(indent, id)
+	} else {
+		deb.singletonValue(indent, id)
+	}
+}
+
+// SingletonValue:
+//
+//	uint(0) FieldValue
+func (deb *debugger) singletonValue(indent tab, id typeId) {
+	deb.dump("Singleton value")
+	// is it a builtin type?
+	wire := deb.wireType[id]
+	if builtinIdToType(id) == nil && wire == nil {
+		errorf("type id %d not defined", id)
+	}
+	m := deb.uint64()
+	if m != 0 {
+		errorf("expected zero; got %d", m)
+	}
+	deb.fieldValue(indent, id)
+}
+
+// InterfaceValue:
+//
+//	NilInterfaceValue | NonNilInterfaceValue
+func (deb *debugger) interfaceValue(indent tab) {
+	deb.dump("Start of interface value")
+	if nameLen := deb.uint64(); nameLen == 0 {
+		deb.nilInterfaceValue(indent)
+	} else {
+		deb.nonNilInterfaceValue(indent, int(nameLen))
+	}
+}
+
+// NilInterfaceValue:
+//
+//	uint(0) [already read]
+func (deb *debugger) nilInterfaceValue(indent tab) int {
+	fmt.Fprintf(os.Stderr, "%snil interface\n", indent)
+	return 0
+}
+
+// NonNilInterfaceValue:
+//
+//	ConcreteTypeName TypeSequence InterfaceContents
+//
+// ConcreteTypeName:
+//
+//	uint(lengthOfName) [already read=n] name
+//
+// InterfaceContents:
+//
+//	int(concreteTypeId) DelimitedValue
+//
+// DelimitedValue:
+//
+//	uint(length) Value
+func (deb *debugger) nonNilInterfaceValue(indent tab, nameLen int) {
+	// ConcreteTypeName
+	b := make([]byte, nameLen)
+	deb.r.Read(b) // TODO: CHECK THESE READS!!
+	deb.consumed(nameLen)
+	name := string(b)
+
+	for {
+		id := deb.typeId()
+		if id < 0 {
+			deb.typeDefinition(indent, -id)
+			n := deb.loadBlock(false)
+			deb.dump("Nested message of length %d", n)
+		} else {
+			// DelimitedValue
+			x := deb.uint64() // in case we want to ignore the value; we don't.
+			fmt.Fprintf(os.Stderr, "%sinterface value, type %q id=%d; valueLength %d\n", indent, name, id, x)
+			deb.value(indent, id)
+			break
+		}
+	}
+}
+
+// printCommonType prints a common type; used by printWireType.
+func (deb *debugger) printCommonType(indent tab, kind string, common *CommonType) {
+	indent.print()
+	fmt.Fprintf(os.Stderr, "%s %q id=%d\n", kind, common.Name, common.Id)
+}
+
+// printWireType prints the contents of a wireType.
+func (deb *debugger) printWireType(indent tab, wire *wireType) {
+	fmt.Fprintf(os.Stderr, "%stype definition {\n", indent)
+	indent++
+	switch {
+	case wire.ArrayT != nil:
+		deb.printCommonType(indent, "array", &wire.ArrayT.CommonType)
+		fmt.Fprintf(os.Stderr, "%slen %d\n", indent+1, wire.ArrayT.Len)
+		fmt.Fprintf(os.Stderr, "%selemid %d\n", indent+1, wire.ArrayT.Elem)
+	case wire.MapT != nil:
+		deb.printCommonType(indent, "map", &wire.MapT.CommonType)
+		fmt.Fprintf(os.Stderr, "%skey id=%d\n", indent+1, wire.MapT.Key)
+		fmt.Fprintf(os.Stderr, "%selem id=%d\n", indent+1, wire.MapT.Elem)
+	case wire.SliceT != nil:
+		deb.printCommonType(indent, "slice", &wire.SliceT.CommonType)
+		fmt.Fprintf(os.Stderr, "%selem id=%d\n", indent+1, wire.SliceT.Elem)
+	case wire.StructT != nil:
+		deb.printCommonType(indent, "struct", &wire.StructT.CommonType)
+		for i, field := range wire.StructT.Field {
+			fmt.Fprintf(os.Stderr, "%sfield %d:\t%s\tid=%d\n", indent+1, i, field.Name, field.Id)
+		}
+	case wire.GobEncoderT != nil:
+		deb.printCommonType(indent, "GobEncoder", &wire.GobEncoderT.CommonType)
+	}
+	indent--
+	fmt.Fprintf(os.Stderr, "%s}\n", indent)
+}
+
+// fieldValue prints a value of any type, such as a struct field.
+// FieldValue:
+//
+//	builtinValue | ArrayValue | MapValue | SliceValue | StructValue | InterfaceValue
+func (deb *debugger) fieldValue(indent tab, id typeId) {
+	if builtinIdToType(id) != nil {
+		if id == tInterface {
+			deb.interfaceValue(indent)
+		} else {
+			deb.printBuiltin(indent, id)
+		}
+		return
+	}
+	wire, ok := deb.wireType[id]
+	if !ok {
+		errorf("type id %d not defined", id)
+	}
+	switch {
+	case wire.ArrayT != nil:
+		deb.arrayValue(indent, wire)
+	case wire.MapT != nil:
+		deb.mapValue(indent, wire)
+	case wire.SliceT != nil:
+		deb.sliceValue(indent, wire)
+	case wire.StructT != nil:
+		deb.structValue(indent, id)
+	case wire.GobEncoderT != nil:
+		deb.gobEncoderValue(indent, id)
+	default:
+		panic("bad wire type for field")
+	}
+}
+
+// printBuiltin prints a value not of a fundamental type, that is,
+// one whose type is known to gobs at bootstrap time.
+func (deb *debugger) printBuiltin(indent tab, id typeId) {
+	switch id {
+	case tBool:
+		x := deb.int64()
+		if x == 0 {
+			fmt.Fprintf(os.Stderr, "%sfalse\n", indent)
+		} else {
+			fmt.Fprintf(os.Stderr, "%strue\n", indent)
+		}
+	case tInt:
+		x := deb.int64()
+		fmt.Fprintf(os.Stderr, "%s%d\n", indent, x)
+	case tUint:
+		x := deb.uint64()
+		fmt.Fprintf(os.Stderr, "%s%d\n", indent, x)
+	case tFloat:
+		x := deb.uint64()
+		fmt.Fprintf(os.Stderr, "%s%g\n", indent, float64FromBits(x))
+	case tComplex:
+		r := deb.uint64()
+		i := deb.uint64()
+		fmt.Fprintf(os.Stderr, "%s%g+%gi\n", indent, float64FromBits(r), float64FromBits(i))
+	case tBytes:
+		x := int(deb.uint64())
+		b := make([]byte, x)
+		deb.r.Read(b)
+		deb.consumed(x)
+		fmt.Fprintf(os.Stderr, "%s{% x}=%q\n", indent, b, b)
+	case tString:
+		x := int(deb.uint64())
+		b := make([]byte, x)
+		deb.r.Read(b)
+		deb.consumed(x)
+		fmt.Fprintf(os.Stderr, "%s%q\n", indent, b)
+	default:
+		panic("unknown builtin")
+	}
+}
+
+// ArrayValue:
+//
+//	uint(n) FieldValue*n
+func (deb *debugger) arrayValue(indent tab, wire *wireType) {
+	elemId := wire.ArrayT.Elem
+	u := deb.uint64()
+	length := int(u)
+	for i := 0; i < length; i++ {
+		deb.fieldValue(indent, elemId)
+	}
+	if length != wire.ArrayT.Len {
+		fmt.Fprintf(os.Stderr, "%s(wrong length for array: %d should be %d)\n", indent, length, wire.ArrayT.Len)
+	}
+}
+
+// MapValue:
+//
+//	uint(n) (FieldValue FieldValue)*n  [n (key, value) pairs]
+func (deb *debugger) mapValue(indent tab, wire *wireType) {
+	keyId := wire.MapT.Key
+	elemId := wire.MapT.Elem
+	u := deb.uint64()
+	length := int(u)
+	for i := 0; i < length; i++ {
+		deb.fieldValue(indent+1, keyId)
+		deb.fieldValue(indent+1, elemId)
+	}
+}
+
+// SliceValue:
+//
+//	uint(n) (n FieldValue)
+func (deb *debugger) sliceValue(indent tab, wire *wireType) {
+	elemId := wire.SliceT.Elem
+	u := deb.uint64()
+	length := int(u)
+	deb.dump("Start of slice of length %d", length)
+
+	for i := 0; i < length; i++ {
+		deb.fieldValue(indent, elemId)
+	}
+}
+
+// StructValue:
+//
+//	(uint(fieldDelta) FieldValue)*
+func (deb *debugger) structValue(indent tab, id typeId) {
+	deb.dump("Start of struct value of %q id=%d\n<<\n", id.name(), id)
+	fmt.Fprintf(os.Stderr, "%s%s struct {\n", indent, id.name())
+	wire, ok := deb.wireType[id]
+	if !ok {
+		errorf("type id %d not defined", id)
+	}
+	strct := wire.StructT
+	fieldNum := -1
+	indent++
+	for {
+		delta := deb.uint64()
+		if delta == 0 { // struct terminator is zero delta fieldnum
+			break
+		}
+		fieldNum += int(delta)
+		if fieldNum < 0 || fieldNum >= len(strct.Field) {
+			deb.dump("field number out of range: prevField=%d delta=%d", fieldNum-int(delta), delta)
+			break
+		}
+		fmt.Fprintf(os.Stderr, "%sfield %d:\t%s\n", indent, fieldNum, wire.StructT.Field[fieldNum].Name)
+		deb.fieldValue(indent+1, strct.Field[fieldNum].Id)
+	}
+	indent--
+	fmt.Fprintf(os.Stderr, "%s} // end %s struct\n", indent, id.name())
+	deb.dump(">> End of struct value of type %d %q", id, id.name())
+}
+
+// GobEncoderValue:
+//
+//	uint(n) byte*n
+func (deb *debugger) gobEncoderValue(indent tab, id typeId) {
+	len := deb.uint64()
+	deb.dump("GobEncoder value of %q id=%d, length %d\n", id.name(), id, len)
+	fmt.Fprintf(os.Stderr, "%s%s (implements GobEncoder)\n", indent, id.name())
+	data := make([]byte, len)
+	_, err := deb.r.Read(data)
+	if err != nil {
+		errorf("gobEncoder data read: %s", err)
+	}
+	fmt.Fprintf(os.Stderr, "%s[% .2x]\n", indent+1, data)
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/dec_helpers.go b/contrib/go/_std_1.22/src/encoding/gob/dec_helpers.go
new file mode 100644
index 0000000000..44a74e2442
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/dec_helpers.go
@@ -0,0 +1,548 @@
+// Code generated by go run decgen.go -output dec_helpers.go; DO NOT EDIT.
+
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import (
+	"math"
+	"reflect"
+)
+
+var decArrayHelper = map[reflect.Kind]decHelper{
+	reflect.Bool:       decBoolArray,
+	reflect.Complex64:  decComplex64Array,
+	reflect.Complex128: decComplex128Array,
+	reflect.Float32:    decFloat32Array,
+	reflect.Float64:    decFloat64Array,
+	reflect.Int:        decIntArray,
+	reflect.Int16:      decInt16Array,
+	reflect.Int32:      decInt32Array,
+	reflect.Int64:      decInt64Array,
+	reflect.Int8:       decInt8Array,
+	reflect.String:     decStringArray,
+	reflect.Uint:       decUintArray,
+	reflect.Uint16:     decUint16Array,
+	reflect.Uint32:     decUint32Array,
+	reflect.Uint64:     decUint64Array,
+	reflect.Uintptr:    decUintptrArray,
+}
+
+var decSliceHelper = map[reflect.Kind]decHelper{
+	reflect.Bool:       decBoolSlice,
+	reflect.Complex64:  decComplex64Slice,
+	reflect.Complex128: decComplex128Slice,
+	reflect.Float32:    decFloat32Slice,
+	reflect.Float64:    decFloat64Slice,
+	reflect.Int:        decIntSlice,
+	reflect.Int16:      decInt16Slice,
+	reflect.Int32:      decInt32Slice,
+	reflect.Int64:      decInt64Slice,
+	reflect.Int8:       decInt8Slice,
+	reflect.String:     decStringSlice,
+	reflect.Uint:       decUintSlice,
+	reflect.Uint16:     decUint16Slice,
+	reflect.Uint32:     decUint32Slice,
+	reflect.Uint64:     decUint64Slice,
+	reflect.Uintptr:    decUintptrSlice,
+}
+
+func decBoolArray(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decBoolSlice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decBoolSlice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]bool)
+	if !ok {
+		// It is kind bool but not type bool. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding bool array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		slice[i] = state.decodeUint() != 0
+	}
+	return true
+}
+
+func decComplex64Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decComplex64Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decComplex64Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]complex64)
+	if !ok {
+		// It is kind complex64 but not type complex64. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding complex64 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		real := float32FromBits(state.decodeUint(), ovfl)
+		imag := float32FromBits(state.decodeUint(), ovfl)
+		slice[i] = complex(float32(real), float32(imag))
+	}
+	return true
+}
+
+func decComplex128Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decComplex128Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decComplex128Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]complex128)
+	if !ok {
+		// It is kind complex128 but not type complex128. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding complex128 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		real := float64FromBits(state.decodeUint())
+		imag := float64FromBits(state.decodeUint())
+		slice[i] = complex(real, imag)
+	}
+	return true
+}
+
+func decFloat32Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decFloat32Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decFloat32Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]float32)
+	if !ok {
+		// It is kind float32 but not type float32. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding float32 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		slice[i] = float32(float32FromBits(state.decodeUint(), ovfl))
+	}
+	return true
+}
+
+func decFloat64Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decFloat64Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decFloat64Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]float64)
+	if !ok {
+		// It is kind float64 but not type float64. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding float64 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		slice[i] = float64FromBits(state.decodeUint())
+	}
+	return true
+}
+
+func decIntArray(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decIntSlice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decIntSlice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]int)
+	if !ok {
+		// It is kind int but not type int. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding int array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeInt()
+		// MinInt and MaxInt
+		if x < ^int64(^uint(0)>>1) || int64(^uint(0)>>1) < x {
+			error_(ovfl)
+		}
+		slice[i] = int(x)
+	}
+	return true
+}
+
+func decInt16Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decInt16Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decInt16Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]int16)
+	if !ok {
+		// It is kind int16 but not type int16. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding int16 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeInt()
+		if x < math.MinInt16 || math.MaxInt16 < x {
+			error_(ovfl)
+		}
+		slice[i] = int16(x)
+	}
+	return true
+}
+
+func decInt32Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decInt32Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decInt32Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]int32)
+	if !ok {
+		// It is kind int32 but not type int32. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding int32 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeInt()
+		if x < math.MinInt32 || math.MaxInt32 < x {
+			error_(ovfl)
+		}
+		slice[i] = int32(x)
+	}
+	return true
+}
+
+func decInt64Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decInt64Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decInt64Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]int64)
+	if !ok {
+		// It is kind int64 but not type int64. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding int64 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		slice[i] = state.decodeInt()
+	}
+	return true
+}
+
+func decInt8Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decInt8Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decInt8Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]int8)
+	if !ok {
+		// It is kind int8 but not type int8. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding int8 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeInt()
+		if x < math.MinInt8 || math.MaxInt8 < x {
+			error_(ovfl)
+		}
+		slice[i] = int8(x)
+	}
+	return true
+}
+
+func decStringArray(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decStringSlice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decStringSlice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]string)
+	if !ok {
+		// It is kind string but not type string. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding string array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		u := state.decodeUint()
+		n := int(u)
+		if n < 0 || uint64(n) != u || n > state.b.Len() {
+			errorf("length of string exceeds input size (%d bytes)", u)
+		}
+		if n > state.b.Len() {
+			errorf("string data too long for buffer: %d", n)
+		}
+		// Read the data.
+		data := state.b.Bytes()
+		if len(data) < n {
+			errorf("invalid string length %d: exceeds input size %d", n, len(data))
+		}
+		slice[i] = string(data[:n])
+		state.b.Drop(n)
+	}
+	return true
+}
+
+func decUintArray(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decUintSlice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decUintSlice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]uint)
+	if !ok {
+		// It is kind uint but not type uint. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding uint array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeUint()
+		/*TODO if math.MaxUint32 < x {
+			error_(ovfl)
+		}*/
+		slice[i] = uint(x)
+	}
+	return true
+}
+
+func decUint16Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decUint16Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decUint16Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]uint16)
+	if !ok {
+		// It is kind uint16 but not type uint16. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding uint16 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeUint()
+		if math.MaxUint16 < x {
+			error_(ovfl)
+		}
+		slice[i] = uint16(x)
+	}
+	return true
+}
+
+func decUint32Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decUint32Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decUint32Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]uint32)
+	if !ok {
+		// It is kind uint32 but not type uint32. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding uint32 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeUint()
+		if math.MaxUint32 < x {
+			error_(ovfl)
+		}
+		slice[i] = uint32(x)
+	}
+	return true
+}
+
+func decUint64Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decUint64Slice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decUint64Slice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]uint64)
+	if !ok {
+		// It is kind uint64 but not type uint64. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding uint64 array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		slice[i] = state.decodeUint()
+	}
+	return true
+}
+
+func decUintptrArray(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return decUintptrSlice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+
+func decUintptrSlice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]uintptr)
+	if !ok {
+		// It is kind uintptr but not type uintptr. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding uintptr array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		x := state.decodeUint()
+		if uint64(^uintptr(0)) < x {
+			error_(ovfl)
+		}
+		slice[i] = uintptr(x)
+	}
+	return true
+}
+
+// growSlice is called for a slice that we only partially allocated,
+// to grow it up to length.
+func growSlice[E any](v reflect.Value, ps *[]E, length int) {
+	var zero E
+	s := *ps
+	s = append(s, zero)
+	cp := cap(s)
+	if cp > length {
+		cp = length
+	}
+	s = s[:cp]
+	v.Set(reflect.ValueOf(s))
+	*ps = s
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/decgen.go b/contrib/go/_std_1.22/src/encoding/gob/decgen.go
new file mode 100644
index 0000000000..27a30eaf61
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/decgen.go
@@ -0,0 +1,265 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build ignore
+
+// encgen writes the helper functions for encoding. Intended to be
+// used with go generate; see the invocation in encode.go.
+
+// TODO: We could do more by being unsafe. Add a -unsafe flag?
+
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"go/format"
+	"log"
+	"os"
+)
+
+var output = flag.String("output", "dec_helpers.go", "file name to write")
+
+type Type struct {
+	lower   string
+	upper   string
+	decoder string
+}
+
+var types = []Type{
+	{
+		"bool",
+		"Bool",
+		`slice[i] = state.decodeUint() != 0`,
+	},
+	{
+		"complex64",
+		"Complex64",
+		`real := float32FromBits(state.decodeUint(), ovfl)
+		imag := float32FromBits(state.decodeUint(), ovfl)
+		slice[i] = complex(float32(real), float32(imag))`,
+	},
+	{
+		"complex128",
+		"Complex128",
+		`real := float64FromBits(state.decodeUint())
+		imag := float64FromBits(state.decodeUint())
+		slice[i] = complex(real, imag)`,
+	},
+	{
+		"float32",
+		"Float32",
+		`slice[i] = float32(float32FromBits(state.decodeUint(), ovfl))`,
+	},
+	{
+		"float64",
+		"Float64",
+		`slice[i] = float64FromBits(state.decodeUint())`,
+	},
+	{
+		"int",
+		"Int",
+		`x := state.decodeInt()
+		// MinInt and MaxInt
+		if x < ^int64(^uint(0)>>1) || int64(^uint(0)>>1) < x {
+			error_(ovfl)
+		}
+		slice[i] = int(x)`,
+	},
+	{
+		"int16",
+		"Int16",
+		`x := state.decodeInt()
+		if x < math.MinInt16 || math.MaxInt16 < x {
+			error_(ovfl)
+		}
+		slice[i] = int16(x)`,
+	},
+	{
+		"int32",
+		"Int32",
+		`x := state.decodeInt()
+		if x < math.MinInt32 || math.MaxInt32 < x {
+			error_(ovfl)
+		}
+		slice[i] = int32(x)`,
+	},
+	{
+		"int64",
+		"Int64",
+		`slice[i] = state.decodeInt()`,
+	},
+	{
+		"int8",
+		"Int8",
+		`x := state.decodeInt()
+		if x < math.MinInt8 || math.MaxInt8 < x {
+			error_(ovfl)
+		}
+		slice[i] = int8(x)`,
+	},
+	{
+		"string",
+		"String",
+		`u := state.decodeUint()
+		n := int(u)
+		if n < 0 || uint64(n) != u || n > state.b.Len() {
+			errorf("length of string exceeds input size (%d bytes)", u)
+		}
+		if n > state.b.Len() {
+			errorf("string data too long for buffer: %d", n)
+		}
+		// Read the data.
+		data := state.b.Bytes()
+		if len(data) < n {
+			errorf("invalid string length %d: exceeds input size %d", n, len(data))
+		}
+		slice[i] = string(data[:n])
+		state.b.Drop(n)`,
+	},
+	{
+		"uint",
+		"Uint",
+		`x := state.decodeUint()
+		/*TODO if math.MaxUint32 < x {
+			error_(ovfl)
+		}*/
+		slice[i] = uint(x)`,
+	},
+	{
+		"uint16",
+		"Uint16",
+		`x := state.decodeUint()
+		if math.MaxUint16 < x {
+			error_(ovfl)
+		}
+		slice[i] = uint16(x)`,
+	},
+	{
+		"uint32",
+		"Uint32",
+		`x := state.decodeUint()
+		if math.MaxUint32 < x {
+			error_(ovfl)
+		}
+		slice[i] = uint32(x)`,
+	},
+	{
+		"uint64",
+		"Uint64",
+		`slice[i] = state.decodeUint()`,
+	},
+	{
+		"uintptr",
+		"Uintptr",
+		`x := state.decodeUint()
+		if uint64(^uintptr(0)) < x {
+			error_(ovfl)
+		}
+		slice[i] = uintptr(x)`,
+	},
+	// uint8 Handled separately.
+}
+
+func main() {
+	log.SetFlags(0)
+	log.SetPrefix("decgen: ")
+	flag.Parse()
+	if flag.NArg() != 0 {
+		log.Fatal("usage: decgen [--output filename]")
+	}
+	var b bytes.Buffer
+	fmt.Fprintf(&b, "// Code generated by go run decgen.go -output %s; DO NOT EDIT.\n", *output)
+	fmt.Fprint(&b, header)
+	printMaps(&b, "Array")
+	fmt.Fprint(&b, "\n")
+	printMaps(&b, "Slice")
+	for _, t := range types {
+		fmt.Fprintf(&b, arrayHelper, t.lower, t.upper)
+		fmt.Fprintf(&b, sliceHelper, t.lower, t.upper, t.decoder)
+	}
+	fmt.Fprintf(&b, trailer)
+	source, err := format.Source(b.Bytes())
+	if err != nil {
+		log.Fatal("source format error:", err)
+	}
+	fd, err := os.Create(*output)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if _, err := fd.Write(source); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func printMaps(b *bytes.Buffer, upperClass string) {
+	fmt.Fprintf(b, "var dec%sHelper = map[reflect.Kind]decHelper{\n", upperClass)
+	for _, t := range types {
+		fmt.Fprintf(b, "reflect.%s: dec%s%s,\n", t.upper, t.upper, upperClass)
+	}
+	fmt.Fprintf(b, "}\n")
+}
+
+const header = `
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import (
+	"math"
+	"reflect"
+)
+
+`
+
+const arrayHelper = `
+func dec%[2]sArray(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return dec%[2]sSlice(state, v.Slice(0, v.Len()), length, ovfl)
+}
+`
+
+const sliceHelper = `
+func dec%[2]sSlice(state *decoderState, v reflect.Value, length int, ovfl error) bool {
+	slice, ok := v.Interface().([]%[1]s)
+	if !ok {
+		// It is kind %[1]s but not type %[1]s. TODO: We can handle this unsafely.
+		return false
+	}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding %[1]s array or slice: length exceeds input size (%%d elements)", length)
+		}
+		if i >= len(slice) {
+			// This is a slice that we only partially allocated.
+			growSlice(v, &slice, length)
+		}
+		%[3]s
+	}
+	return true
+}
+`
+
+const trailer = `
+// growSlice is called for a slice that we only partially allocated,
+// to grow it up to length.
+func growSlice[E any](v reflect.Value, ps *[]E, length int) {
+	var zero E
+	s := *ps
+	s = append(s, zero)
+	cp := cap(s)
+	if cp > length {
+		cp = length
+	}
+	s = s[:cp]
+	v.Set(reflect.ValueOf(s))
+	*ps = s
+}
+`
diff --git a/contrib/go/_std_1.22/src/encoding/gob/decode.go b/contrib/go/_std_1.22/src/encoding/gob/decode.go
new file mode 100644
index 0000000000..d178b2b2fb
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/decode.go
@@ -0,0 +1,1306 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:generate go run decgen.go -output dec_helpers.go
+
+package gob
+
+import (
+	"encoding"
+	"errors"
+	"internal/saferio"
+	"io"
+	"math"
+	"math/bits"
+	"reflect"
+)
+
+var (
+	errBadUint = errors.New("gob: encoded unsigned integer out of range")
+	errBadType = errors.New("gob: unknown type id or corrupted data")
+	errRange   = errors.New("gob: bad data: field numbers out of bounds")
+)
+
+type decHelper func(state *decoderState, v reflect.Value, length int, ovfl error) bool
+
+// decoderState is the execution state of an instance of the decoder. A new state
+// is created for nested objects.
+type decoderState struct {
+	dec *Decoder
+	// The buffer is stored with an extra indirection because it may be replaced
+	// if we load a type during decode (when reading an interface value).
+	b        *decBuffer
+	fieldnum int           // the last field number read.
+	next     *decoderState // for free list
+}
+
+// decBuffer is an extremely simple, fast implementation of a read-only byte buffer.
+// It is initialized by calling Size and then copying the data into the slice returned by Bytes().
+type decBuffer struct {
+	data   []byte
+	offset int // Read offset.
+}
+
+func (d *decBuffer) Read(p []byte) (int, error) {
+	n := copy(p, d.data[d.offset:])
+	if n == 0 && len(p) != 0 {
+		return 0, io.EOF
+	}
+	d.offset += n
+	return n, nil
+}
+
+func (d *decBuffer) Drop(n int) {
+	if n > d.Len() {
+		panic("drop")
+	}
+	d.offset += n
+}
+
+func (d *decBuffer) ReadByte() (byte, error) {
+	if d.offset >= len(d.data) {
+		return 0, io.EOF
+	}
+	c := d.data[d.offset]
+	d.offset++
+	return c, nil
+}
+
+func (d *decBuffer) Len() int {
+	return len(d.data) - d.offset
+}
+
+func (d *decBuffer) Bytes() []byte {
+	return d.data[d.offset:]
+}
+
+// SetBytes sets the buffer to the bytes, discarding any existing data.
+func (d *decBuffer) SetBytes(data []byte) {
+	d.data = data
+	d.offset = 0
+}
+
+func (d *decBuffer) Reset() {
+	d.data = d.data[0:0]
+	d.offset = 0
+}
+
+// We pass the bytes.Buffer separately for easier testing of the infrastructure
+// without requiring a full Decoder.
+func (dec *Decoder) newDecoderState(buf *decBuffer) *decoderState {
+	d := dec.freeList
+	if d == nil {
+		d = new(decoderState)
+		d.dec = dec
+	} else {
+		dec.freeList = d.next
+	}
+	d.b = buf
+	return d
+}
+
+func (dec *Decoder) freeDecoderState(d *decoderState) {
+	d.next = dec.freeList
+	dec.freeList = d
+}
+
+func overflow(name string) error {
+	return errors.New(`value for "` + name + `" out of range`)
+}
+
+// decodeUintReader reads an encoded unsigned integer from an io.Reader.
+// Used only by the Decoder to read the message length.
+func decodeUintReader(r io.Reader, buf []byte) (x uint64, width int, err error) {
+	width = 1
+	n, err := io.ReadFull(r, buf[0:width])
+	if n == 0 {
+		return
+	}
+	b := buf[0]
+	if b <= 0x7f {
+		return uint64(b), width, nil
+	}
+	n = -int(int8(b))
+	if n > uint64Size {
+		err = errBadUint
+		return
+	}
+	width, err = io.ReadFull(r, buf[0:n])
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return
+	}
+	// Could check that the high byte is zero but it's not worth it.
+	for _, b := range buf[0:width] {
+		x = x<<8 | uint64(b)
+	}
+	width++ // +1 for length byte
+	return
+}
+
+// decodeUint reads an encoded unsigned integer from state.r.
+// Does not check for overflow.
+func (state *decoderState) decodeUint() (x uint64) {
+	b, err := state.b.ReadByte()
+	if err != nil {
+		error_(err)
+	}
+	if b <= 0x7f {
+		return uint64(b)
+	}
+	n := -int(int8(b))
+	if n > uint64Size {
+		error_(errBadUint)
+	}
+	buf := state.b.Bytes()
+	if len(buf) < n {
+		errorf("invalid uint data length %d: exceeds input size %d", n, len(buf))
+	}
+	// Don't need to check error; it's safe to loop regardless.
+	// Could check that the high byte is zero but it's not worth it.
+	for _, b := range buf[0:n] {
+		x = x<<8 | uint64(b)
+	}
+	state.b.Drop(n)
+	return x
+}
+
+// decodeInt reads an encoded signed integer from state.r.
+// Does not check for overflow.
+func (state *decoderState) decodeInt() int64 {
+	x := state.decodeUint()
+	if x&1 != 0 {
+		return ^int64(x >> 1)
+	}
+	return int64(x >> 1)
+}
+
+// getLength decodes the next uint and makes sure it is a possible
+// size for a data item that follows, which means it must fit in a
+// non-negative int and fit in the buffer.
+func (state *decoderState) getLength() (int, bool) {
+	n := int(state.decodeUint())
+	if n < 0 || state.b.Len() < n || tooBig <= n {
+		return 0, false
+	}
+	return n, true
+}
+
+// decOp is the signature of a decoding operator for a given type.
+type decOp func(i *decInstr, state *decoderState, v reflect.Value)
+
+// The 'instructions' of the decoding machine
+type decInstr struct {
+	op    decOp
+	field int   // field number of the wire type
+	index []int // field access indices for destination type
+	ovfl  error // error message for overflow/underflow (for arrays, of the elements)
+}
+
+// ignoreUint discards a uint value with no destination.
+func ignoreUint(i *decInstr, state *decoderState, v reflect.Value) {
+	state.decodeUint()
+}
+
+// ignoreTwoUints discards a uint value with no destination. It's used to skip
+// complex values.
+func ignoreTwoUints(i *decInstr, state *decoderState, v reflect.Value) {
+	state.decodeUint()
+	state.decodeUint()
+}
+
+// Since the encoder writes no zeros, if we arrive at a decoder we have
+// a value to extract and store. The field number has already been read
+// (it's how we knew to call this decoder).
+// Each decoder is responsible for handling any indirections associated
+// with the data structure. If any pointer so reached is nil, allocation must
+// be done.
+
+// decAlloc takes a value and returns a settable value that can
+// be assigned to. If the value is a pointer, decAlloc guarantees it points to storage.
+// The callers to the individual decoders are expected to have used decAlloc.
+// The individual decoders don't need it.
+func decAlloc(v reflect.Value) reflect.Value {
+	for v.Kind() == reflect.Pointer {
+		if v.IsNil() {
+			v.Set(reflect.New(v.Type().Elem()))
+		}
+		v = v.Elem()
+	}
+	return v
+}
+
+// decBool decodes a uint and stores it as a boolean in value.
+func decBool(i *decInstr, state *decoderState, value reflect.Value) {
+	value.SetBool(state.decodeUint() != 0)
+}
+
+// decInt8 decodes an integer and stores it as an int8 in value.
+func decInt8(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeInt()
+	if v < math.MinInt8 || math.MaxInt8 < v {
+		error_(i.ovfl)
+	}
+	value.SetInt(v)
+}
+
+// decUint8 decodes an unsigned integer and stores it as a uint8 in value.
+func decUint8(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeUint()
+	if math.MaxUint8 < v {
+		error_(i.ovfl)
+	}
+	value.SetUint(v)
+}
+
+// decInt16 decodes an integer and stores it as an int16 in value.
+func decInt16(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeInt()
+	if v < math.MinInt16 || math.MaxInt16 < v {
+		error_(i.ovfl)
+	}
+	value.SetInt(v)
+}
+
+// decUint16 decodes an unsigned integer and stores it as a uint16 in value.
+func decUint16(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeUint()
+	if math.MaxUint16 < v {
+		error_(i.ovfl)
+	}
+	value.SetUint(v)
+}
+
+// decInt32 decodes an integer and stores it as an int32 in value.
+func decInt32(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeInt()
+	if v < math.MinInt32 || math.MaxInt32 < v {
+		error_(i.ovfl)
+	}
+	value.SetInt(v)
+}
+
+// decUint32 decodes an unsigned integer and stores it as a uint32 in value.
+func decUint32(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeUint()
+	if math.MaxUint32 < v {
+		error_(i.ovfl)
+	}
+	value.SetUint(v)
+}
+
+// decInt64 decodes an integer and stores it as an int64 in value.
+func decInt64(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeInt()
+	value.SetInt(v)
+}
+
+// decUint64 decodes an unsigned integer and stores it as a uint64 in value.
+func decUint64(i *decInstr, state *decoderState, value reflect.Value) {
+	v := state.decodeUint()
+	value.SetUint(v)
+}
+
+// Floating-point numbers are transmitted as uint64s holding the bits
+// of the underlying representation. They are sent byte-reversed, with
+// the exponent end coming out first, so integer floating point numbers
+// (for example) transmit more compactly. This routine does the
+// unswizzling.
+func float64FromBits(u uint64) float64 {
+	v := bits.ReverseBytes64(u)
+	return math.Float64frombits(v)
+}
+
+// float32FromBits decodes an unsigned integer, treats it as a 32-bit floating-point
+// number, and returns it. It's a helper function for float32 and complex64.
+// It returns a float64 because that's what reflection needs, but its return
+// value is known to be accurately representable in a float32.
+func float32FromBits(u uint64, ovfl error) float64 {
+	v := float64FromBits(u)
+	av := v
+	if av < 0 {
+		av = -av
+	}
+	// +Inf is OK in both 32- and 64-bit floats. Underflow is always OK.
+	if math.MaxFloat32 < av && av <= math.MaxFloat64 {
+		error_(ovfl)
+	}
+	return v
+}
+
+// decFloat32 decodes an unsigned integer, treats it as a 32-bit floating-point
+// number, and stores it in value.
+func decFloat32(i *decInstr, state *decoderState, value reflect.Value) {
+	value.SetFloat(float32FromBits(state.decodeUint(), i.ovfl))
+}
+
+// decFloat64 decodes an unsigned integer, treats it as a 64-bit floating-point
+// number, and stores it in value.
+func decFloat64(i *decInstr, state *decoderState, value reflect.Value) {
+	value.SetFloat(float64FromBits(state.decodeUint()))
+}
+
+// decComplex64 decodes a pair of unsigned integers, treats them as a
+// pair of floating point numbers, and stores them as a complex64 in value.
+// The real part comes first.
+func decComplex64(i *decInstr, state *decoderState, value reflect.Value) {
+	real := float32FromBits(state.decodeUint(), i.ovfl)
+	imag := float32FromBits(state.decodeUint(), i.ovfl)
+	value.SetComplex(complex(real, imag))
+}
+
+// decComplex128 decodes a pair of unsigned integers, treats them as a
+// pair of floating point numbers, and stores them as a complex128 in value.
+// The real part comes first.
+func decComplex128(i *decInstr, state *decoderState, value reflect.Value) {
+	real := float64FromBits(state.decodeUint())
+	imag := float64FromBits(state.decodeUint())
+	value.SetComplex(complex(real, imag))
+}
+
+// decUint8Slice decodes a byte slice and stores in value a slice header
+// describing the data.
+// uint8 slices are encoded as an unsigned count followed by the raw bytes.
+func decUint8Slice(i *decInstr, state *decoderState, value reflect.Value) {
+	n, ok := state.getLength()
+	if !ok {
+		errorf("bad %s slice length: %d", value.Type(), n)
+	}
+	if value.Cap() < n {
+		safe := saferio.SliceCap[byte](uint64(n))
+		if safe < 0 {
+			errorf("%s slice too big: %d elements", value.Type(), n)
+		}
+		value.Set(reflect.MakeSlice(value.Type(), safe, safe))
+		ln := safe
+		i := 0
+		for i < n {
+			if i >= ln {
+				// We didn't allocate the entire slice,
+				// due to using saferio.SliceCap.
+				// Grow the slice for one more element.
+				// The slice is full, so this should
+				// bump up the capacity.
+				value.Grow(1)
+			}
+			// Copy into s up to the capacity or n,
+			// whichever is less.
+			ln = value.Cap()
+			if ln > n {
+				ln = n
+			}
+			value.SetLen(ln)
+			sub := value.Slice(i, ln)
+			if _, err := state.b.Read(sub.Bytes()); err != nil {
+				errorf("error decoding []byte at %d: %s", i, err)
+			}
+			i = ln
+		}
+	} else {
+		value.SetLen(n)
+		if _, err := state.b.Read(value.Bytes()); err != nil {
+			errorf("error decoding []byte: %s", err)
+		}
+	}
+}
+
+// decString decodes byte array and stores in value a string header
+// describing the data.
+// Strings are encoded as an unsigned count followed by the raw bytes.
+func decString(i *decInstr, state *decoderState, value reflect.Value) {
+	n, ok := state.getLength()
+	if !ok {
+		errorf("bad %s slice length: %d", value.Type(), n)
+	}
+	// Read the data.
+	data := state.b.Bytes()
+	if len(data) < n {
+		errorf("invalid string length %d: exceeds input size %d", n, len(data))
+	}
+	s := string(data[:n])
+	state.b.Drop(n)
+	value.SetString(s)
+}
+
+// ignoreUint8Array skips over the data for a byte slice value with no destination.
+func ignoreUint8Array(i *decInstr, state *decoderState, value reflect.Value) {
+	n, ok := state.getLength()
+	if !ok {
+		errorf("slice length too large")
+	}
+	bn := state.b.Len()
+	if bn < n {
+		errorf("invalid slice length %d: exceeds input size %d", n, bn)
+	}
+	state.b.Drop(n)
+}
+
+// Execution engine
+
+// The encoder engine is an array of instructions indexed by field number of the incoming
+// decoder. It is executed with random access according to field number.
+type decEngine struct {
+	instr    []decInstr
+	numInstr int // the number of active instructions
+}
+
+// decodeSingle decodes a top-level value that is not a struct and stores it in value.
+// Such values are preceded by a zero, making them have the memory layout of a
+// struct field (although with an illegal field number).
+func (dec *Decoder) decodeSingle(engine *decEngine, value reflect.Value) {
+	state := dec.newDecoderState(&dec.buf)
+	defer dec.freeDecoderState(state)
+	state.fieldnum = singletonField
+	if state.decodeUint() != 0 {
+		errorf("decode: corrupted data: non-zero delta for singleton")
+	}
+	instr := &engine.instr[singletonField]
+	instr.op(instr, state, value)
+}
+
+// decodeStruct decodes a top-level struct and stores it in value.
+// Indir is for the value, not the type. At the time of the call it may
+// differ from ut.indir, which was computed when the engine was built.
+// This state cannot arise for decodeSingle, which is called directly
+// from the user's value, not from the innards of an engine.
+func (dec *Decoder) decodeStruct(engine *decEngine, value reflect.Value) {
+	state := dec.newDecoderState(&dec.buf)
+	defer dec.freeDecoderState(state)
+	state.fieldnum = -1
+	for state.b.Len() > 0 {
+		delta := int(state.decodeUint())
+		if delta < 0 {
+			errorf("decode: corrupted data: negative delta")
+		}
+		if delta == 0 { // struct terminator is zero delta fieldnum
+			break
+		}
+		if state.fieldnum >= len(engine.instr)-delta { // subtract to compare without overflow
+			error_(errRange)
+		}
+		fieldnum := state.fieldnum + delta
+		instr := &engine.instr[fieldnum]
+		var field reflect.Value
+		if instr.index != nil {
+			// Otherwise the field is unknown to us and instr.op is an ignore op.
+			field = value.FieldByIndex(instr.index)
+			if field.Kind() == reflect.Pointer {
+				field = decAlloc(field)
+			}
+		}
+		instr.op(instr, state, field)
+		state.fieldnum = fieldnum
+	}
+}
+
+var noValue reflect.Value
+
+// ignoreStruct discards the data for a struct with no destination.
+func (dec *Decoder) ignoreStruct(engine *decEngine) {
+	state := dec.newDecoderState(&dec.buf)
+	defer dec.freeDecoderState(state)
+	state.fieldnum = -1
+	for state.b.Len() > 0 {
+		delta := int(state.decodeUint())
+		if delta < 0 {
+			errorf("ignore decode: corrupted data: negative delta")
+		}
+		if delta == 0 { // struct terminator is zero delta fieldnum
+			break
+		}
+		fieldnum := state.fieldnum + delta
+		if fieldnum >= len(engine.instr) {
+			error_(errRange)
+		}
+		instr := &engine.instr[fieldnum]
+		instr.op(instr, state, noValue)
+		state.fieldnum = fieldnum
+	}
+}
+
+// ignoreSingle discards the data for a top-level non-struct value with no
+// destination. It's used when calling Decode with a nil value.
+func (dec *Decoder) ignoreSingle(engine *decEngine) {
+	state := dec.newDecoderState(&dec.buf)
+	defer dec.freeDecoderState(state)
+	state.fieldnum = singletonField
+	delta := int(state.decodeUint())
+	if delta != 0 {
+		errorf("decode: corrupted data: non-zero delta for singleton")
+	}
+	instr := &engine.instr[singletonField]
+	instr.op(instr, state, noValue)
+}
+
+// decodeArrayHelper does the work for decoding arrays and slices.
+func (dec *Decoder) decodeArrayHelper(state *decoderState, value reflect.Value, elemOp decOp, length int, ovfl error, helper decHelper) {
+	if helper != nil && helper(state, value, length, ovfl) {
+		return
+	}
+	instr := &decInstr{elemOp, 0, nil, ovfl}
+	isPtr := value.Type().Elem().Kind() == reflect.Pointer
+	ln := value.Len()
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding array or slice: length exceeds input size (%d elements)", length)
+		}
+		if i >= ln {
+			// This is a slice that we only partially allocated.
+			// Grow it up to length.
+			value.Grow(1)
+			cp := value.Cap()
+			if cp > length {
+				cp = length
+			}
+			value.SetLen(cp)
+			ln = cp
+		}
+		v := value.Index(i)
+		if isPtr {
+			v = decAlloc(v)
+		}
+		elemOp(instr, state, v)
+	}
+}
+
+// decodeArray decodes an array and stores it in value.
+// The length is an unsigned integer preceding the elements. Even though the length is redundant
+// (it's part of the type), it's a useful check and is included in the encoding.
+func (dec *Decoder) decodeArray(state *decoderState, value reflect.Value, elemOp decOp, length int, ovfl error, helper decHelper) {
+	if n := state.decodeUint(); n != uint64(length) {
+		errorf("length mismatch in decodeArray")
+	}
+	dec.decodeArrayHelper(state, value, elemOp, length, ovfl, helper)
+}
+
+// decodeIntoValue is a helper for map decoding.
+func decodeIntoValue(state *decoderState, op decOp, isPtr bool, value reflect.Value, instr *decInstr) reflect.Value {
+	v := value
+	if isPtr {
+		v = decAlloc(value)
+	}
+
+	op(instr, state, v)
+	return value
+}
+
+// decodeMap decodes a map and stores it in value.
+// Maps are encoded as a length followed by key:value pairs.
+// Because the internals of maps are not visible to us, we must
+// use reflection rather than pointer magic.
+func (dec *Decoder) decodeMap(mtyp reflect.Type, state *decoderState, value reflect.Value, keyOp, elemOp decOp, ovfl error) {
+	n := int(state.decodeUint())
+	if value.IsNil() {
+		value.Set(reflect.MakeMapWithSize(mtyp, n))
+	}
+	keyIsPtr := mtyp.Key().Kind() == reflect.Pointer
+	elemIsPtr := mtyp.Elem().Kind() == reflect.Pointer
+	keyInstr := &decInstr{keyOp, 0, nil, ovfl}
+	elemInstr := &decInstr{elemOp, 0, nil, ovfl}
+	keyP := reflect.New(mtyp.Key())
+	elemP := reflect.New(mtyp.Elem())
+	for i := 0; i < n; i++ {
+		key := decodeIntoValue(state, keyOp, keyIsPtr, keyP.Elem(), keyInstr)
+		elem := decodeIntoValue(state, elemOp, elemIsPtr, elemP.Elem(), elemInstr)
+		value.SetMapIndex(key, elem)
+		keyP.Elem().SetZero()
+		elemP.Elem().SetZero()
+	}
+}
+
+// ignoreArrayHelper does the work for discarding arrays and slices.
+func (dec *Decoder) ignoreArrayHelper(state *decoderState, elemOp decOp, length int) {
+	instr := &decInstr{elemOp, 0, nil, errors.New("no error")}
+	for i := 0; i < length; i++ {
+		if state.b.Len() == 0 {
+			errorf("decoding array or slice: length exceeds input size (%d elements)", length)
+		}
+		elemOp(instr, state, noValue)
+	}
+}
+
+// ignoreArray discards the data for an array value with no destination.
+func (dec *Decoder) ignoreArray(state *decoderState, elemOp decOp, length int) {
+	if n := state.decodeUint(); n != uint64(length) {
+		errorf("length mismatch in ignoreArray")
+	}
+	dec.ignoreArrayHelper(state, elemOp, length)
+}
+
+// ignoreMap discards the data for a map value with no destination.
+func (dec *Decoder) ignoreMap(state *decoderState, keyOp, elemOp decOp) {
+	n := int(state.decodeUint())
+	keyInstr := &decInstr{keyOp, 0, nil, errors.New("no error")}
+	elemInstr := &decInstr{elemOp, 0, nil, errors.New("no error")}
+	for i := 0; i < n; i++ {
+		keyOp(keyInstr, state, noValue)
+		elemOp(elemInstr, state, noValue)
+	}
+}
+
+// decodeSlice decodes a slice and stores it in value.
+// Slices are encoded as an unsigned length followed by the elements.
+func (dec *Decoder) decodeSlice(state *decoderState, value reflect.Value, elemOp decOp, ovfl error, helper decHelper) {
+	u := state.decodeUint()
+	typ := value.Type()
+	size := uint64(typ.Elem().Size())
+	nBytes := u * size
+	n := int(u)
+	// Take care with overflow in this calculation.
+	if n < 0 || uint64(n) != u || nBytes > tooBig || (size > 0 && nBytes/size != u) {
+		// We don't check n against buffer length here because if it's a slice
+		// of interfaces, there will be buffer reloads.
+		errorf("%s slice too big: %d elements of %d bytes", typ.Elem(), u, size)
+	}
+	if value.Cap() < n {
+		safe := saferio.SliceCapWithSize(size, uint64(n))
+		if safe < 0 {
+			errorf("%s slice too big: %d elements of %d bytes", typ.Elem(), u, size)
+		}
+		value.Set(reflect.MakeSlice(typ, safe, safe))
+	} else {
+		value.SetLen(n)
+	}
+	dec.decodeArrayHelper(state, value, elemOp, n, ovfl, helper)
+}
+
+// ignoreSlice skips over the data for a slice value with no destination.
+func (dec *Decoder) ignoreSlice(state *decoderState, elemOp decOp) {
+	dec.ignoreArrayHelper(state, elemOp, int(state.decodeUint()))
+}
+
+// decodeInterface decodes an interface value and stores it in value.
+// Interfaces are encoded as the name of a concrete type followed by a value.
+// If the name is empty, the value is nil and no value is sent.
+func (dec *Decoder) decodeInterface(ityp reflect.Type, state *decoderState, value reflect.Value) {
+	// Read the name of the concrete type.
+	nr := state.decodeUint()
+	if nr > 1<<31 { // zero is permissible for anonymous types
+		errorf("invalid type name length %d", nr)
+	}
+	if nr > uint64(state.b.Len()) {
+		errorf("invalid type name length %d: exceeds input size", nr)
+	}
+	n := int(nr)
+	name := state.b.Bytes()[:n]
+	state.b.Drop(n)
+	// Allocate the destination interface value.
+	if len(name) == 0 {
+		// Copy the nil interface value to the target.
+		value.SetZero()
+		return
+	}
+	if len(name) > 1024 {
+		errorf("name too long (%d bytes): %.20q...", len(name), name)
+	}
+	// The concrete type must be registered.
+	typi, ok := nameToConcreteType.Load(string(name))
+	if !ok {
+		errorf("name not registered for interface: %q", name)
+	}
+	typ := typi.(reflect.Type)
+
+	// Read the type id of the concrete value.
+	concreteId := dec.decodeTypeSequence(true)
+	if concreteId < 0 {
+		error_(dec.err)
+	}
+	// Byte count of value is next; we don't care what it is (it's there
+	// in case we want to ignore the value by skipping it completely).
+	state.decodeUint()
+	// Read the concrete value.
+	v := allocValue(typ)
+	dec.decodeValue(concreteId, v)
+	if dec.err != nil {
+		error_(dec.err)
+	}
+	// Assign the concrete value to the interface.
+	// Tread carefully; it might not satisfy the interface.
+	if !typ.AssignableTo(ityp) {
+		errorf("%s is not assignable to type %s", typ, ityp)
+	}
+	// Copy the interface value to the target.
+	value.Set(v)
+}
+
+// ignoreInterface discards the data for an interface value with no destination.
+func (dec *Decoder) ignoreInterface(state *decoderState) {
+	// Read the name of the concrete type.
+	n, ok := state.getLength()
+	if !ok {
+		errorf("bad interface encoding: name too large for buffer")
+	}
+	bn := state.b.Len()
+	if bn < n {
+		errorf("invalid interface value length %d: exceeds input size %d", n, bn)
+	}
+	state.b.Drop(n)
+	id := dec.decodeTypeSequence(true)
+	if id < 0 {
+		error_(dec.err)
+	}
+	// At this point, the decoder buffer contains a delimited value. Just toss it.
+	n, ok = state.getLength()
+	if !ok {
+		errorf("bad interface encoding: data length too large for buffer")
+	}
+	state.b.Drop(n)
+}
+
+// decodeGobDecoder decodes something implementing the GobDecoder interface.
+// The data is encoded as a byte slice.
+func (dec *Decoder) decodeGobDecoder(ut *userTypeInfo, state *decoderState, value reflect.Value) {
+	// Read the bytes for the value.
+	n, ok := state.getLength()
+	if !ok {
+		errorf("GobDecoder: length too large for buffer")
+	}
+	b := state.b.Bytes()
+	if len(b) < n {
+		errorf("GobDecoder: invalid data length %d: exceeds input size %d", n, len(b))
+	}
+	b = b[:n]
+	state.b.Drop(n)
+	var err error
+	// We know it's one of these.
+	switch ut.externalDec {
+	case xGob:
+		err = value.Interface().(GobDecoder).GobDecode(b)
+	case xBinary:
+		err = value.Interface().(encoding.BinaryUnmarshaler).UnmarshalBinary(b)
+	case xText:
+		err = value.Interface().(encoding.TextUnmarshaler).UnmarshalText(b)
+	}
+	if err != nil {
+		error_(err)
+	}
+}
+
+// ignoreGobDecoder discards the data for a GobDecoder value with no destination.
+func (dec *Decoder) ignoreGobDecoder(state *decoderState) {
+	// Read the bytes for the value.
+	n, ok := state.getLength()
+	if !ok {
+		errorf("GobDecoder: length too large for buffer")
+	}
+	bn := state.b.Len()
+	if bn < n {
+		errorf("GobDecoder: invalid data length %d: exceeds input size %d", n, bn)
+	}
+	state.b.Drop(n)
+}
+
+// Index by Go types.
+var decOpTable = [...]decOp{
+	reflect.Bool:       decBool,
+	reflect.Int8:       decInt8,
+	reflect.Int16:      decInt16,
+	reflect.Int32:      decInt32,
+	reflect.Int64:      decInt64,
+	reflect.Uint8:      decUint8,
+	reflect.Uint16:     decUint16,
+	reflect.Uint32:     decUint32,
+	reflect.Uint64:     decUint64,
+	reflect.Float32:    decFloat32,
+	reflect.Float64:    decFloat64,
+	reflect.Complex64:  decComplex64,
+	reflect.Complex128: decComplex128,
+	reflect.String:     decString,
+}
+
+// Indexed by gob types.  tComplex will be added during type.init().
+var decIgnoreOpMap = map[typeId]decOp{
+	tBool:    ignoreUint,
+	tInt:     ignoreUint,
+	tUint:    ignoreUint,
+	tFloat:   ignoreUint,
+	tBytes:   ignoreUint8Array,
+	tString:  ignoreUint8Array,
+	tComplex: ignoreTwoUints,
+}
+
+// decOpFor returns the decoding op for the base type under rt and
+// the indirection count to reach it.
+func (dec *Decoder) decOpFor(wireId typeId, rt reflect.Type, name string, inProgress map[reflect.Type]*decOp) *decOp {
+	ut := userType(rt)
+	// If the type implements GobEncoder, we handle it without further processing.
+	if ut.externalDec != 0 {
+		return dec.gobDecodeOpFor(ut)
+	}
+
+	// If this type is already in progress, it's a recursive type (e.g. map[string]*T).
+	// Return the pointer to the op we're already building.
+	if opPtr := inProgress[rt]; opPtr != nil {
+		return opPtr
+	}
+	typ := ut.base
+	var op decOp
+	k := typ.Kind()
+	if int(k) < len(decOpTable) {
+		op = decOpTable[k]
+	}
+	if op == nil {
+		inProgress[rt] = &op
+		// Special cases
+		switch t := typ; t.Kind() {
+		case reflect.Array:
+			name = "element of " + name
+			elemId := dec.wireType[wireId].ArrayT.Elem
+			elemOp := dec.decOpFor(elemId, t.Elem(), name, inProgress)
+			ovfl := overflow(name)
+			helper := decArrayHelper[t.Elem().Kind()]
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.decodeArray(state, value, *elemOp, t.Len(), ovfl, helper)
+			}
+
+		case reflect.Map:
+			keyId := dec.wireType[wireId].MapT.Key
+			elemId := dec.wireType[wireId].MapT.Elem
+			keyOp := dec.decOpFor(keyId, t.Key(), "key of "+name, inProgress)
+			elemOp := dec.decOpFor(elemId, t.Elem(), "element of "+name, inProgress)
+			ovfl := overflow(name)
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.decodeMap(t, state, value, *keyOp, *elemOp, ovfl)
+			}
+
+		case reflect.Slice:
+			name = "element of " + name
+			if t.Elem().Kind() == reflect.Uint8 {
+				op = decUint8Slice
+				break
+			}
+			var elemId typeId
+			if tt := builtinIdToType(wireId); tt != nil {
+				elemId = tt.(*sliceType).Elem
+			} else {
+				elemId = dec.wireType[wireId].SliceT.Elem
+			}
+			elemOp := dec.decOpFor(elemId, t.Elem(), name, inProgress)
+			ovfl := overflow(name)
+			helper := decSliceHelper[t.Elem().Kind()]
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.decodeSlice(state, value, *elemOp, ovfl, helper)
+			}
+
+		case reflect.Struct:
+			// Generate a closure that calls out to the engine for the nested type.
+			ut := userType(typ)
+			enginePtr, err := dec.getDecEnginePtr(wireId, ut)
+			if err != nil {
+				error_(err)
+			}
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				// indirect through enginePtr to delay evaluation for recursive structs.
+				dec.decodeStruct(*enginePtr, value)
+			}
+		case reflect.Interface:
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.decodeInterface(t, state, value)
+			}
+		}
+	}
+	if op == nil {
+		errorf("decode can't handle type %s", rt)
+	}
+	return &op
+}
+
+var maxIgnoreNestingDepth = 10000
+
+// decIgnoreOpFor returns the decoding op for a field that has no destination.
+func (dec *Decoder) decIgnoreOpFor(wireId typeId, inProgress map[typeId]*decOp, depth int) *decOp {
+	if depth > maxIgnoreNestingDepth {
+		error_(errors.New("invalid nesting depth"))
+	}
+	// If this type is already in progress, it's a recursive type (e.g. map[string]*T).
+	// Return the pointer to the op we're already building.
+	if opPtr := inProgress[wireId]; opPtr != nil {
+		return opPtr
+	}
+	op, ok := decIgnoreOpMap[wireId]
+	if !ok {
+		inProgress[wireId] = &op
+		if wireId == tInterface {
+			// Special case because it's a method: the ignored item might
+			// define types and we need to record their state in the decoder.
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.ignoreInterface(state)
+			}
+			return &op
+		}
+		// Special cases
+		wire := dec.wireType[wireId]
+		switch {
+		case wire == nil:
+			errorf("bad data: undefined type %s", wireId.string())
+		case wire.ArrayT != nil:
+			elemId := wire.ArrayT.Elem
+			elemOp := dec.decIgnoreOpFor(elemId, inProgress, depth+1)
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.ignoreArray(state, *elemOp, wire.ArrayT.Len)
+			}
+
+		case wire.MapT != nil:
+			keyId := dec.wireType[wireId].MapT.Key
+			elemId := dec.wireType[wireId].MapT.Elem
+			keyOp := dec.decIgnoreOpFor(keyId, inProgress, depth+1)
+			elemOp := dec.decIgnoreOpFor(elemId, inProgress, depth+1)
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.ignoreMap(state, *keyOp, *elemOp)
+			}
+
+		case wire.SliceT != nil:
+			elemId := wire.SliceT.Elem
+			elemOp := dec.decIgnoreOpFor(elemId, inProgress, depth+1)
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.ignoreSlice(state, *elemOp)
+			}
+
+		case wire.StructT != nil:
+			// Generate a closure that calls out to the engine for the nested type.
+			enginePtr, err := dec.getIgnoreEnginePtr(wireId)
+			if err != nil {
+				error_(err)
+			}
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				// indirect through enginePtr to delay evaluation for recursive structs
+				state.dec.ignoreStruct(*enginePtr)
+			}
+
+		case wire.GobEncoderT != nil, wire.BinaryMarshalerT != nil, wire.TextMarshalerT != nil:
+			op = func(i *decInstr, state *decoderState, value reflect.Value) {
+				state.dec.ignoreGobDecoder(state)
+			}
+		}
+	}
+	if op == nil {
+		errorf("bad data: ignore can't handle type %s", wireId.string())
+	}
+	return &op
+}
+
+// gobDecodeOpFor returns the op for a type that is known to implement
+// GobDecoder.
+func (dec *Decoder) gobDecodeOpFor(ut *userTypeInfo) *decOp {
+	rcvrType := ut.user
+	if ut.decIndir == -1 {
+		rcvrType = reflect.PointerTo(rcvrType)
+	} else if ut.decIndir > 0 {
+		for i := int8(0); i < ut.decIndir; i++ {
+			rcvrType = rcvrType.Elem()
+		}
+	}
+	var op decOp
+	op = func(i *decInstr, state *decoderState, value reflect.Value) {
+		// We now have the base type. We need its address if the receiver is a pointer.
+		if value.Kind() != reflect.Pointer && rcvrType.Kind() == reflect.Pointer {
+			value = value.Addr()
+		}
+		state.dec.decodeGobDecoder(ut, state, value)
+	}
+	return &op
+}
+
+// compatibleType asks: Are these two gob Types compatible?
+// Answers the question for basic types, arrays, maps and slices, plus
+// GobEncoder/Decoder pairs.
+// Structs are considered ok; fields will be checked later.
+func (dec *Decoder) compatibleType(fr reflect.Type, fw typeId, inProgress map[reflect.Type]typeId) bool {
+	if rhs, ok := inProgress[fr]; ok {
+		return rhs == fw
+	}
+	inProgress[fr] = fw
+	ut := userType(fr)
+	wire, ok := dec.wireType[fw]
+	// If wire was encoded with an encoding method, fr must have that method.
+	// And if not, it must not.
+	// At most one of the booleans in ut is set.
+	// We could possibly relax this constraint in the future in order to
+	// choose the decoding method using the data in the wireType.
+	// The parentheses look odd but are correct.
+	if (ut.externalDec == xGob) != (ok && wire.GobEncoderT != nil) ||
+		(ut.externalDec == xBinary) != (ok && wire.BinaryMarshalerT != nil) ||
+		(ut.externalDec == xText) != (ok && wire.TextMarshalerT != nil) {
+		return false
+	}
+	if ut.externalDec != 0 { // This test trumps all others.
+		return true
+	}
+	switch t := ut.base; t.Kind() {
+	default:
+		// chan, etc: cannot handle.
+		return false
+	case reflect.Bool:
+		return fw == tBool
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return fw == tInt
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return fw == tUint
+	case reflect.Float32, reflect.Float64:
+		return fw == tFloat
+	case reflect.Complex64, reflect.Complex128:
+		return fw == tComplex
+	case reflect.String:
+		return fw == tString
+	case reflect.Interface:
+		return fw == tInterface
+	case reflect.Array:
+		if !ok || wire.ArrayT == nil {
+			return false
+		}
+		array := wire.ArrayT
+		return t.Len() == array.Len && dec.compatibleType(t.Elem(), array.Elem, inProgress)
+	case reflect.Map:
+		if !ok || wire.MapT == nil {
+			return false
+		}
+		MapType := wire.MapT
+		return dec.compatibleType(t.Key(), MapType.Key, inProgress) && dec.compatibleType(t.Elem(), MapType.Elem, inProgress)
+	case reflect.Slice:
+		// Is it an array of bytes?
+		if t.Elem().Kind() == reflect.Uint8 {
+			return fw == tBytes
+		}
+		// Extract and compare element types.
+		var sw *sliceType
+		if tt := builtinIdToType(fw); tt != nil {
+			sw, _ = tt.(*sliceType)
+		} else if wire != nil {
+			sw = wire.SliceT
+		}
+		elem := userType(t.Elem()).base
+		return sw != nil && dec.compatibleType(elem, sw.Elem, inProgress)
+	case reflect.Struct:
+		return true
+	}
+}
+
+// typeString returns a human-readable description of the type identified by remoteId.
+func (dec *Decoder) typeString(remoteId typeId) string {
+	typeLock.Lock()
+	defer typeLock.Unlock()
+	if t := idToType(remoteId); t != nil {
+		// globally known type.
+		return t.string()
+	}
+	return dec.wireType[remoteId].string()
+}
+
+// compileSingle compiles the decoder engine for a non-struct top-level value, including
+// GobDecoders.
+func (dec *Decoder) compileSingle(remoteId typeId, ut *userTypeInfo) (engine *decEngine, err error) {
+	rt := ut.user
+	engine = new(decEngine)
+	engine.instr = make([]decInstr, 1) // one item
+	name := rt.String()                // best we can do
+	if !dec.compatibleType(rt, remoteId, make(map[reflect.Type]typeId)) {
+		remoteType := dec.typeString(remoteId)
+		// Common confusing case: local interface type, remote concrete type.
+		if ut.base.Kind() == reflect.Interface && remoteId != tInterface {
+			return nil, errors.New("gob: local interface type " + name + " can only be decoded from remote interface type; received concrete type " + remoteType)
+		}
+		return nil, errors.New("gob: decoding into local type " + name + ", received remote type " + remoteType)
+	}
+	op := dec.decOpFor(remoteId, rt, name, make(map[reflect.Type]*decOp))
+	ovfl := errors.New(`value for "` + name + `" out of range`)
+	engine.instr[singletonField] = decInstr{*op, singletonField, nil, ovfl}
+	engine.numInstr = 1
+	return
+}
+
+// compileIgnoreSingle compiles the decoder engine for a non-struct top-level value that will be discarded.
+func (dec *Decoder) compileIgnoreSingle(remoteId typeId) *decEngine {
+	engine := new(decEngine)
+	engine.instr = make([]decInstr, 1) // one item
+	op := dec.decIgnoreOpFor(remoteId, make(map[typeId]*decOp), 0)
+	ovfl := overflow(dec.typeString(remoteId))
+	engine.instr[0] = decInstr{*op, 0, nil, ovfl}
+	engine.numInstr = 1
+	return engine
+}
+
+// compileDec compiles the decoder engine for a value. If the value is not a struct,
+// it calls out to compileSingle.
+func (dec *Decoder) compileDec(remoteId typeId, ut *userTypeInfo) (engine *decEngine, err error) {
+	defer catchError(&err)
+	rt := ut.base
+	srt := rt
+	if srt.Kind() != reflect.Struct || ut.externalDec != 0 {
+		return dec.compileSingle(remoteId, ut)
+	}
+	var wireStruct *structType
+	// Builtin types can come from global pool; the rest must be defined by the decoder.
+	// Also we know we're decoding a struct now, so the client must have sent one.
+	if t := builtinIdToType(remoteId); t != nil {
+		wireStruct, _ = t.(*structType)
+	} else {
+		wire := dec.wireType[remoteId]
+		if wire == nil {
+			error_(errBadType)
+		}
+		wireStruct = wire.StructT
+	}
+	if wireStruct == nil {
+		errorf("type mismatch in decoder: want struct type %s; got non-struct", rt)
+	}
+	engine = new(decEngine)
+	engine.instr = make([]decInstr, len(wireStruct.Field))
+	seen := make(map[reflect.Type]*decOp)
+	// Loop over the fields of the wire type.
+	for fieldnum := 0; fieldnum < len(wireStruct.Field); fieldnum++ {
+		wireField := wireStruct.Field[fieldnum]
+		if wireField.Name == "" {
+			errorf("empty name for remote field of type %s", wireStruct.Name)
+		}
+		ovfl := overflow(wireField.Name)
+		// Find the field of the local type with the same name.
+		localField, present := srt.FieldByName(wireField.Name)
+		// TODO(r): anonymous names
+		if !present || !isExported(wireField.Name) {
+			op := dec.decIgnoreOpFor(wireField.Id, make(map[typeId]*decOp), 0)
+			engine.instr[fieldnum] = decInstr{*op, fieldnum, nil, ovfl}
+			continue
+		}
+		if !dec.compatibleType(localField.Type, wireField.Id, make(map[reflect.Type]typeId)) {
+			errorf("wrong type (%s) for received field %s.%s", localField.Type, wireStruct.Name, wireField.Name)
+		}
+		op := dec.decOpFor(wireField.Id, localField.Type, localField.Name, seen)
+		engine.instr[fieldnum] = decInstr{*op, fieldnum, localField.Index, ovfl}
+		engine.numInstr++
+	}
+	return
+}
+
+// getDecEnginePtr returns the engine for the specified type.
+func (dec *Decoder) getDecEnginePtr(remoteId typeId, ut *userTypeInfo) (enginePtr **decEngine, err error) {
+	rt := ut.user
+	decoderMap, ok := dec.decoderCache[rt]
+	if !ok {
+		decoderMap = make(map[typeId]**decEngine)
+		dec.decoderCache[rt] = decoderMap
+	}
+	if enginePtr, ok = decoderMap[remoteId]; !ok {
+		// To handle recursive types, mark this engine as underway before compiling.
+		enginePtr = new(*decEngine)
+		decoderMap[remoteId] = enginePtr
+		*enginePtr, err = dec.compileDec(remoteId, ut)
+		if err != nil {
+			delete(decoderMap, remoteId)
+		}
+	}
+	return
+}
+
+// emptyStruct is the type we compile into when ignoring a struct value.
+type emptyStruct struct{}
+
+var emptyStructType = reflect.TypeFor[emptyStruct]()
+
+// getIgnoreEnginePtr returns the engine for the specified type when the value is to be discarded.
+func (dec *Decoder) getIgnoreEnginePtr(wireId typeId) (enginePtr **decEngine, err error) {
+	var ok bool
+	if enginePtr, ok = dec.ignorerCache[wireId]; !ok {
+		// To handle recursive types, mark this engine as underway before compiling.
+		enginePtr = new(*decEngine)
+		dec.ignorerCache[wireId] = enginePtr
+		wire := dec.wireType[wireId]
+		if wire != nil && wire.StructT != nil {
+			*enginePtr, err = dec.compileDec(wireId, userType(emptyStructType))
+		} else {
+			*enginePtr = dec.compileIgnoreSingle(wireId)
+		}
+		if err != nil {
+			delete(dec.ignorerCache, wireId)
+		}
+	}
+	return
+}
+
+// decodeValue decodes the data stream representing a value and stores it in value.
+func (dec *Decoder) decodeValue(wireId typeId, value reflect.Value) {
+	defer catchError(&dec.err)
+	// If the value is nil, it means we should just ignore this item.
+	if !value.IsValid() {
+		dec.decodeIgnoredValue(wireId)
+		return
+	}
+	// Dereference down to the underlying type.
+	ut := userType(value.Type())
+	base := ut.base
+	var enginePtr **decEngine
+	enginePtr, dec.err = dec.getDecEnginePtr(wireId, ut)
+	if dec.err != nil {
+		return
+	}
+	value = decAlloc(value)
+	engine := *enginePtr
+	if st := base; st.Kind() == reflect.Struct && ut.externalDec == 0 {
+		wt := dec.wireType[wireId]
+		if engine.numInstr == 0 && st.NumField() > 0 &&
+			wt != nil && len(wt.StructT.Field) > 0 {
+			name := base.Name()
+			errorf("type mismatch: no fields matched compiling decoder for %s", name)
+		}
+		dec.decodeStruct(engine, value)
+	} else {
+		dec.decodeSingle(engine, value)
+	}
+}
+
+// decodeIgnoredValue decodes the data stream representing a value of the specified type and discards it.
+func (dec *Decoder) decodeIgnoredValue(wireId typeId) {
+	var enginePtr **decEngine
+	enginePtr, dec.err = dec.getIgnoreEnginePtr(wireId)
+	if dec.err != nil {
+		return
+	}
+	wire := dec.wireType[wireId]
+	if wire != nil && wire.StructT != nil {
+		dec.ignoreStruct(*enginePtr)
+	} else {
+		dec.ignoreSingle(*enginePtr)
+	}
+}
+
+const (
+	intBits     = 32 << (^uint(0) >> 63)
+	uintptrBits = 32 << (^uintptr(0) >> 63)
+)
+
+func init() {
+	var iop, uop decOp
+	switch intBits {
+	case 32:
+		iop = decInt32
+		uop = decUint32
+	case 64:
+		iop = decInt64
+		uop = decUint64
+	default:
+		panic("gob: unknown size of int/uint")
+	}
+	decOpTable[reflect.Int] = iop
+	decOpTable[reflect.Uint] = uop
+
+	// Finally uintptr
+	switch uintptrBits {
+	case 32:
+		uop = decUint32
+	case 64:
+		uop = decUint64
+	default:
+		panic("gob: unknown size of uintptr")
+	}
+	decOpTable[reflect.Uintptr] = uop
+}
+
+// Gob depends on being able to take the address
+// of zeroed Values it creates, so use this wrapper instead
+// of the standard reflect.Zero.
+// Each call allocates once.
+func allocValue(t reflect.Type) reflect.Value {
+	return reflect.New(t).Elem()
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/decoder.go b/contrib/go/_std_1.22/src/encoding/gob/decoder.go
new file mode 100644
index 0000000000..c4b6088013
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/decoder.go
@@ -0,0 +1,237 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import (
+	"bufio"
+	"errors"
+	"internal/saferio"
+	"io"
+	"reflect"
+	"sync"
+)
+
+// tooBig provides a sanity check for sizes; used in several places. Upper limit
+// of is 1GB on 32-bit systems, 8GB on 64-bit, allowing room to grow a little
+// without overflow.
+const tooBig = (1 << 30) << (^uint(0) >> 62)
+
+// A Decoder manages the receipt of type and data information read from the
+// remote side of a connection.  It is safe for concurrent use by multiple
+// goroutines.
+//
+// The Decoder does only basic sanity checking on decoded input sizes,
+// and its limits are not configurable. Take caution when decoding gob data
+// from untrusted sources.
+type Decoder struct {
+	mutex        sync.Mutex                              // each item must be received atomically
+	r            io.Reader                               // source of the data
+	buf          decBuffer                               // buffer for more efficient i/o from r
+	wireType     map[typeId]*wireType                    // map from remote ID to local description
+	decoderCache map[reflect.Type]map[typeId]**decEngine // cache of compiled engines
+	ignorerCache map[typeId]**decEngine                  // ditto for ignored objects
+	freeList     *decoderState                           // list of free decoderStates; avoids reallocation
+	countBuf     []byte                                  // used for decoding integers while parsing messages
+	err          error
+}
+
+// NewDecoder returns a new decoder that reads from the [io.Reader].
+// If r does not also implement [io.ByteReader], it will be wrapped in a
+// [bufio.Reader].
+func NewDecoder(r io.Reader) *Decoder {
+	dec := new(Decoder)
+	// We use the ability to read bytes as a plausible surrogate for buffering.
+	if _, ok := r.(io.ByteReader); !ok {
+		r = bufio.NewReader(r)
+	}
+	dec.r = r
+	dec.wireType = make(map[typeId]*wireType)
+	dec.decoderCache = make(map[reflect.Type]map[typeId]**decEngine)
+	dec.ignorerCache = make(map[typeId]**decEngine)
+	dec.countBuf = make([]byte, 9) // counts may be uint64s (unlikely!), require 9 bytes
+
+	return dec
+}
+
+// recvType loads the definition of a type.
+func (dec *Decoder) recvType(id typeId) {
+	// Have we already seen this type? That's an error
+	if id < firstUserId || dec.wireType[id] != nil {
+		dec.err = errors.New("gob: duplicate type received")
+		return
+	}
+
+	// Type:
+	wire := new(wireType)
+	dec.decodeValue(tWireType, reflect.ValueOf(wire))
+	if dec.err != nil {
+		return
+	}
+	// Remember we've seen this type.
+	dec.wireType[id] = wire
+}
+
+var errBadCount = errors.New("invalid message length")
+
+// recvMessage reads the next count-delimited item from the input. It is the converse
+// of Encoder.writeMessage. It returns false on EOF or other error reading the message.
+func (dec *Decoder) recvMessage() bool {
+	// Read a count.
+	nbytes, _, err := decodeUintReader(dec.r, dec.countBuf)
+	if err != nil {
+		dec.err = err
+		return false
+	}
+	if nbytes >= tooBig {
+		dec.err = errBadCount
+		return false
+	}
+	dec.readMessage(int(nbytes))
+	return dec.err == nil
+}
+
+// readMessage reads the next nbytes bytes from the input.
+func (dec *Decoder) readMessage(nbytes int) {
+	if dec.buf.Len() != 0 {
+		// The buffer should always be empty now.
+		panic("non-empty decoder buffer")
+	}
+	// Read the data
+	var buf []byte
+	buf, dec.err = saferio.ReadData(dec.r, uint64(nbytes))
+	dec.buf.SetBytes(buf)
+	if dec.err == io.EOF {
+		dec.err = io.ErrUnexpectedEOF
+	}
+}
+
+// toInt turns an encoded uint64 into an int, according to the marshaling rules.
+func toInt(x uint64) int64 {
+	i := int64(x >> 1)
+	if x&1 != 0 {
+		i = ^i
+	}
+	return i
+}
+
+func (dec *Decoder) nextInt() int64 {
+	n, _, err := decodeUintReader(&dec.buf, dec.countBuf)
+	if err != nil {
+		dec.err = err
+	}
+	return toInt(n)
+}
+
+func (dec *Decoder) nextUint() uint64 {
+	n, _, err := decodeUintReader(&dec.buf, dec.countBuf)
+	if err != nil {
+		dec.err = err
+	}
+	return n
+}
+
+// decodeTypeSequence parses:
+// TypeSequence
+//
+//	(TypeDefinition DelimitedTypeDefinition*)?
+//
+// and returns the type id of the next value. It returns -1 at
+// EOF.  Upon return, the remainder of dec.buf is the value to be
+// decoded. If this is an interface value, it can be ignored by
+// resetting that buffer.
+func (dec *Decoder) decodeTypeSequence(isInterface bool) typeId {
+	firstMessage := true
+	for dec.err == nil {
+		if dec.buf.Len() == 0 {
+			if !dec.recvMessage() {
+				// We can only return io.EOF if the input was empty.
+				// If we read one or more type spec messages,
+				// require a data item message to follow.
+				// If we hit an EOF before that, then give ErrUnexpectedEOF.
+				if !firstMessage && dec.err == io.EOF {
+					dec.err = io.ErrUnexpectedEOF
+				}
+				break
+			}
+		}
+		// Receive a type id.
+		id := typeId(dec.nextInt())
+		if id >= 0 {
+			// Value follows.
+			return id
+		}
+		// Type definition for (-id) follows.
+		dec.recvType(-id)
+		if dec.err != nil {
+			break
+		}
+		// When decoding an interface, after a type there may be a
+		// DelimitedValue still in the buffer. Skip its count.
+		// (Alternatively, the buffer is empty and the byte count
+		// will be absorbed by recvMessage.)
+		if dec.buf.Len() > 0 {
+			if !isInterface {
+				dec.err = errors.New("extra data in buffer")
+				break
+			}
+			dec.nextUint()
+		}
+		firstMessage = false
+	}
+	return -1
+}
+
+// Decode reads the next value from the input stream and stores
+// it in the data represented by the empty interface value.
+// If e is nil, the value will be discarded. Otherwise,
+// the value underlying e must be a pointer to the
+// correct type for the next data item received.
+// If the input is at EOF, Decode returns [io.EOF] and
+// does not modify e.
+func (dec *Decoder) Decode(e any) error {
+	if e == nil {
+		return dec.DecodeValue(reflect.Value{})
+	}
+	value := reflect.ValueOf(e)
+	// If e represents a value as opposed to a pointer, the answer won't
+	// get back to the caller. Make sure it's a pointer.
+	if value.Type().Kind() != reflect.Pointer {
+		dec.err = errors.New("gob: attempt to decode into a non-pointer")
+		return dec.err
+	}
+	return dec.DecodeValue(value)
+}
+
+// DecodeValue reads the next value from the input stream.
+// If v is the zero reflect.Value (v.Kind() == Invalid), DecodeValue discards the value.
+// Otherwise, it stores the value into v. In that case, v must represent
+// a non-nil pointer to data or be an assignable reflect.Value (v.CanSet())
+// If the input is at EOF, DecodeValue returns [io.EOF] and
+// does not modify v.
+func (dec *Decoder) DecodeValue(v reflect.Value) error {
+	if v.IsValid() {
+		if v.Kind() == reflect.Pointer && !v.IsNil() {
+			// That's okay, we'll store through the pointer.
+		} else if !v.CanSet() {
+			return errors.New("gob: DecodeValue of unassignable value")
+		}
+	}
+	// Make sure we're single-threaded through here.
+	dec.mutex.Lock()
+	defer dec.mutex.Unlock()
+
+	dec.buf.Reset() // In case data lingers from previous invocation.
+	dec.err = nil
+	id := dec.decodeTypeSequence(false)
+	if dec.err == nil {
+		dec.decodeValue(id, v)
+	}
+	return dec.err
+}
+
+// If debug.go is compiled into the program, debugFunc prints a human-readable
+// representation of the gob data read from r by calling that file's Debug function.
+// Otherwise it is nil.
+var debugFunc func(io.Reader)
diff --git a/contrib/go/_std_1.22/src/encoding/gob/doc.go b/contrib/go/_std_1.22/src/encoding/gob/doc.go
new file mode 100644
index 0000000000..3f26ed8591
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/doc.go
@@ -0,0 +1,423 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package gob manages streams of gobs - binary values exchanged between an
+[Encoder] (transmitter) and a [Decoder] (receiver). A typical use is transporting
+arguments and results of remote procedure calls (RPCs) such as those provided by
+[net/rpc].
+
+The implementation compiles a custom codec for each data type in the stream and
+is most efficient when a single [Encoder] is used to transmit a stream of values,
+amortizing the cost of compilation.
+
+# Basics
+
+A stream of gobs is self-describing. Each data item in the stream is preceded by
+a specification of its type, expressed in terms of a small set of predefined
+types. Pointers are not transmitted, but the things they point to are
+transmitted; that is, the values are flattened. Nil pointers are not permitted,
+as they have no value. Recursive types work fine, but
+recursive values (data with cycles) are problematic. This may change.
+
+To use gobs, create an [Encoder] and present it with a series of data items as
+values or addresses that can be dereferenced to values. The [Encoder] makes sure
+all type information is sent before it is needed. At the receive side, a
+[Decoder] retrieves values from the encoded stream and unpacks them into local
+variables.
+
+# Types and Values
+
+The source and destination values/types need not correspond exactly. For structs,
+fields (identified by name) that are in the source but absent from the receiving
+variable will be ignored. Fields that are in the receiving variable but missing
+from the transmitted type or value will be ignored in the destination. If a field
+with the same name is present in both, their types must be compatible. Both the
+receiver and transmitter will do all necessary indirection and dereferencing to
+convert between gobs and actual Go values. For instance, a gob type that is
+schematically,
+
+	struct { A, B int }
+
+can be sent from or received into any of these Go types:
+
+	struct { A, B int }	// the same
+	*struct { A, B int }	// extra indirection of the struct
+	struct { *A, **B int }	// extra indirection of the fields
+	struct { A, B int64 }	// different concrete value type; see below
+
+It may also be received into any of these:
+
+	struct { A, B int }	// the same
+	struct { B, A int }	// ordering doesn't matter; matching is by name
+	struct { A, B, C int }	// extra field (C) ignored
+	struct { B int }	// missing field (A) ignored; data will be dropped
+	struct { B, C int }	// missing field (A) ignored; extra field (C) ignored.
+
+Attempting to receive into these types will draw a decode error:
+
+	struct { A int; B uint }	// change of signedness for B
+	struct { A int; B float }	// change of type for B
+	struct { }			// no field names in common
+	struct { C, D int }		// no field names in common
+
+Integers are transmitted two ways: arbitrary precision signed integers or
+arbitrary precision unsigned integers. There is no int8, int16 etc.
+discrimination in the gob format; there are only signed and unsigned integers. As
+described below, the transmitter sends the value in a variable-length encoding;
+the receiver accepts the value and stores it in the destination variable.
+Floating-point numbers are always sent using IEEE-754 64-bit precision (see
+below).
+
+Signed integers may be received into any signed integer variable: int, int16, etc.;
+unsigned integers may be received into any unsigned integer variable; and floating
+point values may be received into any floating point variable. However,
+the destination variable must be able to represent the value or the decode
+operation will fail.
+
+Structs, arrays and slices are also supported. Structs encode and decode only
+exported fields. Strings and arrays of bytes are supported with a special,
+efficient representation (see below). When a slice is decoded, if the existing
+slice has capacity the slice will be extended in place; if not, a new array is
+allocated. Regardless, the length of the resulting slice reports the number of
+elements decoded.
+
+In general, if allocation is required, the decoder will allocate memory. If not,
+it will update the destination variables with values read from the stream. It does
+not initialize them first, so if the destination is a compound value such as a
+map, struct, or slice, the decoded values will be merged elementwise into the
+existing variables.
+
+Functions and channels will not be sent in a gob. Attempting to encode such a value
+at the top level will fail. A struct field of chan or func type is treated exactly
+like an unexported field and is ignored.
+
+Gob can encode a value of any type implementing the [GobEncoder] or
+[encoding.BinaryMarshaler] interfaces by calling the corresponding method,
+in that order of preference.
+
+Gob can decode a value of any type implementing the [GobDecoder] or
+[encoding.BinaryUnmarshaler] interfaces by calling the corresponding method,
+again in that order of preference.
+
+# Encoding Details
+
+This section documents the encoding, details that are not important for most
+users. Details are presented bottom-up.
+
+An unsigned integer is sent one of two ways. If it is less than 128, it is sent
+as a byte with that value. Otherwise it is sent as a minimal-length big-endian
+(high byte first) byte stream holding the value, preceded by one byte holding the
+byte count, negated. Thus 0 is transmitted as (00), 7 is transmitted as (07) and
+256 is transmitted as (FE 01 00).
+
+A boolean is encoded within an unsigned integer: 0 for false, 1 for true.
+
+A signed integer, i, is encoded within an unsigned integer, u. Within u, bits 1
+upward contain the value; bit 0 says whether they should be complemented upon
+receipt. The encode algorithm looks like this:
+
+	var u uint
+	if i < 0 {
+		u = (^uint(i) << 1) | 1 // complement i, bit 0 is 1
+	} else {
+		u = (uint(i) << 1) // do not complement i, bit 0 is 0
+	}
+	encodeUnsigned(u)
+
+The low bit is therefore analogous to a sign bit, but making it the complement bit
+instead guarantees that the largest negative integer is not a special case. For
+example, -129=^128=(^256>>1) encodes as (FE 01 01).
+
+Floating-point numbers are always sent as a representation of a float64 value.
+That value is converted to a uint64 using [math.Float64bits]. The uint64 is then
+byte-reversed and sent as a regular unsigned integer. The byte-reversal means the
+exponent and high-precision part of the mantissa go first. Since the low bits are
+often zero, this can save encoding bytes. For instance, 17.0 is encoded in only
+three bytes (FE 31 40).
+
+Strings and slices of bytes are sent as an unsigned count followed by that many
+uninterpreted bytes of the value.
+
+All other slices and arrays are sent as an unsigned count followed by that many
+elements using the standard gob encoding for their type, recursively.
+
+Maps are sent as an unsigned count followed by that many key, element
+pairs. Empty but non-nil maps are sent, so if the receiver has not allocated
+one already, one will always be allocated on receipt unless the transmitted map
+is nil and not at the top level.
+
+In slices and arrays, as well as maps, all elements, even zero-valued elements,
+are transmitted, even if all the elements are zero.
+
+Structs are sent as a sequence of (field number, field value) pairs. The field
+value is sent using the standard gob encoding for its type, recursively. If a
+field has the zero value for its type (except for arrays; see above), it is omitted
+from the transmission. The field number is defined by the type of the encoded
+struct: the first field of the encoded type is field 0, the second is field 1,
+etc. When encoding a value, the field numbers are delta encoded for efficiency
+and the fields are always sent in order of increasing field number; the deltas are
+therefore unsigned. The initialization for the delta encoding sets the field
+number to -1, so an unsigned integer field 0 with value 7 is transmitted as unsigned
+delta = 1, unsigned value = 7 or (01 07). Finally, after all the fields have been
+sent a terminating mark denotes the end of the struct. That mark is a delta=0
+value, which has representation (00).
+
+Interface types are not checked for compatibility; all interface types are
+treated, for transmission, as members of a single "interface" type, analogous to
+int or []byte - in effect they're all treated as interface{}. Interface values
+are transmitted as a string identifying the concrete type being sent (a name
+that must be pre-defined by calling [Register]), followed by a byte count of the
+length of the following data (so the value can be skipped if it cannot be
+stored), followed by the usual encoding of concrete (dynamic) value stored in
+the interface value. (A nil interface value is identified by the empty string
+and transmits no value.) Upon receipt, the decoder verifies that the unpacked
+concrete item satisfies the interface of the receiving variable.
+
+If a value is passed to [Encoder.Encode] and the type is not a struct (or pointer to struct,
+etc.), for simplicity of processing it is represented as a struct of one field.
+The only visible effect of this is to encode a zero byte after the value, just as
+after the last field of an encoded struct, so that the decode algorithm knows when
+the top-level value is complete.
+
+The representation of types is described below. When a type is defined on a given
+connection between an [Encoder] and [Decoder], it is assigned a signed integer type
+id. When [Encoder.Encode](v) is called, it makes sure there is an id assigned for
+the type of v and all its elements and then it sends the pair (typeid, encoded-v)
+where typeid is the type id of the encoded type of v and encoded-v is the gob
+encoding of the value v.
+
+To define a type, the encoder chooses an unused, positive type id and sends the
+pair (-type id, encoded-type) where encoded-type is the gob encoding of a wireType
+description, constructed from these types:
+
+	type wireType struct {
+		ArrayT           *ArrayType
+		SliceT           *SliceType
+		StructT          *StructType
+		MapT             *MapType
+		GobEncoderT      *gobEncoderType
+		BinaryMarshalerT *gobEncoderType
+		TextMarshalerT   *gobEncoderType
+
+	}
+	type arrayType struct {
+		CommonType
+		Elem typeId
+		Len  int
+	}
+	type CommonType struct {
+		Name string // the name of the struct type
+		Id  int    // the id of the type, repeated so it's inside the type
+	}
+	type sliceType struct {
+		CommonType
+		Elem typeId
+	}
+	type structType struct {
+		CommonType
+		Field []*fieldType // the fields of the struct.
+	}
+	type fieldType struct {
+		Name string // the name of the field.
+		Id   int    // the type id of the field, which must be already defined
+	}
+	type mapType struct {
+		CommonType
+		Key  typeId
+		Elem typeId
+	}
+	type gobEncoderType struct {
+		CommonType
+	}
+
+If there are nested type ids, the types for all inner type ids must be defined
+before the top-level type id is used to describe an encoded-v.
+
+For simplicity in setup, the connection is defined to understand these types a
+priori, as well as the basic gob types int, uint, etc. Their ids are:
+
+	bool        1
+	int         2
+	uint        3
+	float       4
+	[]byte      5
+	string      6
+	complex     7
+	interface   8
+	// gap for reserved ids.
+	WireType    16
+	ArrayType   17
+	CommonType  18
+	SliceType   19
+	StructType  20
+	FieldType   21
+	// 22 is slice of fieldType.
+	MapType     23
+
+Finally, each message created by a call to Encode is preceded by an encoded
+unsigned integer count of the number of bytes remaining in the message. After
+the initial type name, interface values are wrapped the same way; in effect, the
+interface value acts like a recursive invocation of Encode.
+
+In summary, a gob stream looks like
+
+	(byteCount (-type id, encoding of a wireType)* (type id, encoding of a value))*
+
+where * signifies zero or more repetitions and the type id of a value must
+be predefined or be defined before the value in the stream.
+
+Compatibility: Any future changes to the package will endeavor to maintain
+compatibility with streams encoded using previous versions. That is, any released
+version of this package should be able to decode data written with any previously
+released version, subject to issues such as security fixes. See the Go compatibility
+document for background: https://golang.org/doc/go1compat
+
+See "Gobs of data" for a design discussion of the gob wire format:
+https://blog.golang.org/gobs-of-data
+
+# Security
+
+This package is not designed to be hardened against adversarial inputs, and is
+outside the scope of https://go.dev/security/policy. In particular, the [Decoder]
+does only basic sanity checking on decoded input sizes, and its limits are not
+configurable. Care should be taken when decoding gob data from untrusted
+sources, which may consume significant resources.
+*/
+package gob
+
+/*
+Grammar:
+
+Tokens starting with a lower case letter are terminals; int(n)
+and uint(n) represent the signed/unsigned encodings of the value n.
+
+GobStream:
+	DelimitedMessage*
+DelimitedMessage:
+	uint(lengthOfMessage) Message
+Message:
+	TypeSequence TypedValue
+TypeSequence
+	(TypeDefinition DelimitedTypeDefinition*)?
+DelimitedTypeDefinition:
+	uint(lengthOfTypeDefinition) TypeDefinition
+TypedValue:
+	int(typeId) Value
+TypeDefinition:
+	int(-typeId) encodingOfWireType
+Value:
+	SingletonValue | StructValue
+SingletonValue:
+	uint(0) FieldValue
+FieldValue:
+	builtinValue | ArrayValue | MapValue | SliceValue | StructValue | InterfaceValue
+InterfaceValue:
+	NilInterfaceValue | NonNilInterfaceValue
+NilInterfaceValue:
+	uint(0)
+NonNilInterfaceValue:
+	ConcreteTypeName TypeSequence InterfaceContents
+ConcreteTypeName:
+	uint(lengthOfName) [already read=n] name
+InterfaceContents:
+	int(concreteTypeId) DelimitedValue
+DelimitedValue:
+	uint(length) Value
+ArrayValue:
+	uint(n) FieldValue*n [n elements]
+MapValue:
+	uint(n) (FieldValue FieldValue)*n  [n (key, value) pairs]
+SliceValue:
+	uint(n) FieldValue*n [n elements]
+StructValue:
+	(uint(fieldDelta) FieldValue)*
+*/
+
+/*
+For implementers and the curious, here is an encoded example. Given
+	type Point struct {X, Y int}
+and the value
+	p := Point{22, 33}
+the bytes transmitted that encode p will be:
+	1f ff 81 03 01 01 05 50 6f 69 6e 74 01 ff 82 00
+	01 02 01 01 58 01 04 00 01 01 59 01 04 00 00 00
+	07 ff 82 01 2c 01 42 00
+They are determined as follows.
+
+Since this is the first transmission of type Point, the type descriptor
+for Point itself must be sent before the value. This is the first type
+we've sent on this Encoder, so it has type id 65 (0 through 64 are
+reserved).
+
+	1f	// This item (a type descriptor) is 31 bytes long.
+	ff 81	// The negative of the id for the type we're defining, -65.
+		// This is one byte (indicated by FF = -1) followed by
+		// ^-65<<1 | 1. The low 1 bit signals to complement the
+		// rest upon receipt.
+
+	// Now we send a type descriptor, which is itself a struct (wireType).
+	// The type of wireType itself is known (it's built in, as is the type of
+	// all its components), so we just need to send a *value* of type wireType
+	// that represents type "Point".
+	// Here starts the encoding of that value.
+	// Set the field number implicitly to -1; this is done at the beginning
+	// of every struct, including nested structs.
+	03	// Add 3 to field number; now 2 (wireType.structType; this is a struct).
+		// structType starts with an embedded CommonType, which appears
+		// as a regular structure here too.
+	01	// add 1 to field number (now 0); start of embedded CommonType.
+	01	// add 1 to field number (now 0, the name of the type)
+	05	// string is (unsigned) 5 bytes long
+	50 6f 69 6e 74	// wireType.structType.CommonType.name = "Point"
+	01	// add 1 to field number (now 1, the id of the type)
+	ff 82	// wireType.structType.CommonType._id = 65
+	00	// end of embedded wiretype.structType.CommonType struct
+	01	// add 1 to field number (now 1, the field array in wireType.structType)
+	02	// There are two fields in the type (len(structType.field))
+	01	// Start of first field structure; add 1 to get field number 0: field[0].name
+	01	// 1 byte
+	58	// structType.field[0].name = "X"
+	01	// Add 1 to get field number 1: field[0].id
+	04	// structType.field[0].typeId is 2 (signed int).
+	00	// End of structType.field[0]; start structType.field[1]; set field number to -1.
+	01	// Add 1 to get field number 0: field[1].name
+	01	// 1 byte
+	59	// structType.field[1].name = "Y"
+	01	// Add 1 to get field number 1: field[1].id
+	04	// struct.Type.field[1].typeId is 2 (signed int).
+	00	// End of structType.field[1]; end of structType.field.
+	00	// end of wireType.structType structure
+	00	// end of wireType structure
+
+Now we can send the Point value. Again the field number resets to -1:
+
+	07	// this value is 7 bytes long
+	ff 82	// the type number, 65 (1 byte (-FF) followed by 65<<1)
+	01	// add one to field number, yielding field 0
+	2c	// encoding of signed "22" (0x2c = 44 = 22<<1); Point.x = 22
+	01	// add one to field number, yielding field 1
+	42	// encoding of signed "33" (0x42 = 66 = 33<<1); Point.y = 33
+	00	// end of structure
+
+The type encoding is long and fairly intricate but we send it only once.
+If p is transmitted a second time, the type is already known so the
+output will be just:
+
+	07 ff 82 01 2c 01 42 00
+
+A single non-struct value at top level is transmitted like a field with
+delta tag 0. For instance, a signed integer with value 3 presented as
+the argument to Encode will emit:
+
+	03 04 00 06
+
+Which represents:
+
+	03	// this value is 3 bytes long
+	04	// the type number, 2, represents an integer
+	00	// tag delta 0
+	06	// value 3
+
+*/
diff --git a/contrib/go/_std_1.22/src/encoding/gob/dump.go b/contrib/go/_std_1.22/src/encoding/gob/dump.go
new file mode 100644
index 0000000000..f4b1bebfba
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/dump.go
@@ -0,0 +1,29 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build ignore
+
+package main
+
+// Need to compile package gob with debug.go to build this program.
+// See comments in debug.go for how to do this.
+
+import (
+	"encoding/gob"
+	"fmt"
+	"os"
+)
+
+func main() {
+	var err error
+	file := os.Stdin
+	if len(os.Args) > 1 {
+		file, err = os.Open(os.Args[1])
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "dump: %s\n", err)
+			os.Exit(1)
+		}
+	}
+	gob.Debug(file)
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/enc_helpers.go b/contrib/go/_std_1.22/src/encoding/gob/enc_helpers.go
new file mode 100644
index 0000000000..c3b4ca8972
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/enc_helpers.go
@@ -0,0 +1,414 @@
+// Code generated by go run encgen.go -output enc_helpers.go; DO NOT EDIT.
+
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import (
+	"reflect"
+)
+
+var encArrayHelper = map[reflect.Kind]encHelper{
+	reflect.Bool:       encBoolArray,
+	reflect.Complex64:  encComplex64Array,
+	reflect.Complex128: encComplex128Array,
+	reflect.Float32:    encFloat32Array,
+	reflect.Float64:    encFloat64Array,
+	reflect.Int:        encIntArray,
+	reflect.Int16:      encInt16Array,
+	reflect.Int32:      encInt32Array,
+	reflect.Int64:      encInt64Array,
+	reflect.Int8:       encInt8Array,
+	reflect.String:     encStringArray,
+	reflect.Uint:       encUintArray,
+	reflect.Uint16:     encUint16Array,
+	reflect.Uint32:     encUint32Array,
+	reflect.Uint64:     encUint64Array,
+	reflect.Uintptr:    encUintptrArray,
+}
+
+var encSliceHelper = map[reflect.Kind]encHelper{
+	reflect.Bool:       encBoolSlice,
+	reflect.Complex64:  encComplex64Slice,
+	reflect.Complex128: encComplex128Slice,
+	reflect.Float32:    encFloat32Slice,
+	reflect.Float64:    encFloat64Slice,
+	reflect.Int:        encIntSlice,
+	reflect.Int16:      encInt16Slice,
+	reflect.Int32:      encInt32Slice,
+	reflect.Int64:      encInt64Slice,
+	reflect.Int8:       encInt8Slice,
+	reflect.String:     encStringSlice,
+	reflect.Uint:       encUintSlice,
+	reflect.Uint16:     encUint16Slice,
+	reflect.Uint32:     encUint32Slice,
+	reflect.Uint64:     encUint64Slice,
+	reflect.Uintptr:    encUintptrSlice,
+}
+
+func encBoolArray(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encBoolSlice(state, v.Slice(0, v.Len()))
+}
+
+func encBoolSlice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]bool)
+	if !ok {
+		// It is kind bool but not type bool. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != false || state.sendZero {
+			if x {
+				state.encodeUint(1)
+			} else {
+				state.encodeUint(0)
+			}
+		}
+	}
+	return true
+}
+
+func encComplex64Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encComplex64Slice(state, v.Slice(0, v.Len()))
+}
+
+func encComplex64Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]complex64)
+	if !ok {
+		// It is kind complex64 but not type complex64. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0+0i || state.sendZero {
+			rpart := floatBits(float64(real(x)))
+			ipart := floatBits(float64(imag(x)))
+			state.encodeUint(rpart)
+			state.encodeUint(ipart)
+		}
+	}
+	return true
+}
+
+func encComplex128Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encComplex128Slice(state, v.Slice(0, v.Len()))
+}
+
+func encComplex128Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]complex128)
+	if !ok {
+		// It is kind complex128 but not type complex128. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0+0i || state.sendZero {
+			rpart := floatBits(real(x))
+			ipart := floatBits(imag(x))
+			state.encodeUint(rpart)
+			state.encodeUint(ipart)
+		}
+	}
+	return true
+}
+
+func encFloat32Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encFloat32Slice(state, v.Slice(0, v.Len()))
+}
+
+func encFloat32Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]float32)
+	if !ok {
+		// It is kind float32 but not type float32. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			bits := floatBits(float64(x))
+			state.encodeUint(bits)
+		}
+	}
+	return true
+}
+
+func encFloat64Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encFloat64Slice(state, v.Slice(0, v.Len()))
+}
+
+func encFloat64Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]float64)
+	if !ok {
+		// It is kind float64 but not type float64. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			bits := floatBits(x)
+			state.encodeUint(bits)
+		}
+	}
+	return true
+}
+
+func encIntArray(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encIntSlice(state, v.Slice(0, v.Len()))
+}
+
+func encIntSlice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]int)
+	if !ok {
+		// It is kind int but not type int. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeInt(int64(x))
+		}
+	}
+	return true
+}
+
+func encInt16Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encInt16Slice(state, v.Slice(0, v.Len()))
+}
+
+func encInt16Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]int16)
+	if !ok {
+		// It is kind int16 but not type int16. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeInt(int64(x))
+		}
+	}
+	return true
+}
+
+func encInt32Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encInt32Slice(state, v.Slice(0, v.Len()))
+}
+
+func encInt32Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]int32)
+	if !ok {
+		// It is kind int32 but not type int32. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeInt(int64(x))
+		}
+	}
+	return true
+}
+
+func encInt64Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encInt64Slice(state, v.Slice(0, v.Len()))
+}
+
+func encInt64Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]int64)
+	if !ok {
+		// It is kind int64 but not type int64. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeInt(x)
+		}
+	}
+	return true
+}
+
+func encInt8Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encInt8Slice(state, v.Slice(0, v.Len()))
+}
+
+func encInt8Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]int8)
+	if !ok {
+		// It is kind int8 but not type int8. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeInt(int64(x))
+		}
+	}
+	return true
+}
+
+func encStringArray(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encStringSlice(state, v.Slice(0, v.Len()))
+}
+
+func encStringSlice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]string)
+	if !ok {
+		// It is kind string but not type string. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != "" || state.sendZero {
+			state.encodeUint(uint64(len(x)))
+			state.b.WriteString(x)
+		}
+	}
+	return true
+}
+
+func encUintArray(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encUintSlice(state, v.Slice(0, v.Len()))
+}
+
+func encUintSlice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]uint)
+	if !ok {
+		// It is kind uint but not type uint. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeUint(uint64(x))
+		}
+	}
+	return true
+}
+
+func encUint16Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encUint16Slice(state, v.Slice(0, v.Len()))
+}
+
+func encUint16Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]uint16)
+	if !ok {
+		// It is kind uint16 but not type uint16. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeUint(uint64(x))
+		}
+	}
+	return true
+}
+
+func encUint32Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encUint32Slice(state, v.Slice(0, v.Len()))
+}
+
+func encUint32Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]uint32)
+	if !ok {
+		// It is kind uint32 but not type uint32. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeUint(uint64(x))
+		}
+	}
+	return true
+}
+
+func encUint64Array(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encUint64Slice(state, v.Slice(0, v.Len()))
+}
+
+func encUint64Slice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]uint64)
+	if !ok {
+		// It is kind uint64 but not type uint64. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeUint(x)
+		}
+	}
+	return true
+}
+
+func encUintptrArray(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return encUintptrSlice(state, v.Slice(0, v.Len()))
+}
+
+func encUintptrSlice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]uintptr)
+	if !ok {
+		// It is kind uintptr but not type uintptr. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != 0 || state.sendZero {
+			state.encodeUint(uint64(x))
+		}
+	}
+	return true
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/encgen.go b/contrib/go/_std_1.22/src/encoding/gob/encgen.go
new file mode 100644
index 0000000000..e5f68786a0
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/encgen.go
@@ -0,0 +1,220 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build ignore
+
+// encgen writes the helper functions for encoding. Intended to be
+// used with go generate; see the invocation in encode.go.
+
+// TODO: We could do more by being unsafe. Add a -unsafe flag?
+
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"go/format"
+	"log"
+	"os"
+)
+
+var output = flag.String("output", "enc_helpers.go", "file name to write")
+
+type Type struct {
+	lower   string
+	upper   string
+	zero    string
+	encoder string
+}
+
+var types = []Type{
+	{
+		"bool",
+		"Bool",
+		"false",
+		`if x {
+			state.encodeUint(1)
+		} else {
+			state.encodeUint(0)
+		}`,
+	},
+	{
+		"complex64",
+		"Complex64",
+		"0+0i",
+		`rpart := floatBits(float64(real(x)))
+		ipart := floatBits(float64(imag(x)))
+		state.encodeUint(rpart)
+		state.encodeUint(ipart)`,
+	},
+	{
+		"complex128",
+		"Complex128",
+		"0+0i",
+		`rpart := floatBits(real(x))
+		ipart := floatBits(imag(x))
+		state.encodeUint(rpart)
+		state.encodeUint(ipart)`,
+	},
+	{
+		"float32",
+		"Float32",
+		"0",
+		`bits := floatBits(float64(x))
+		state.encodeUint(bits)`,
+	},
+	{
+		"float64",
+		"Float64",
+		"0",
+		`bits := floatBits(x)
+		state.encodeUint(bits)`,
+	},
+	{
+		"int",
+		"Int",
+		"0",
+		`state.encodeInt(int64(x))`,
+	},
+	{
+		"int16",
+		"Int16",
+		"0",
+		`state.encodeInt(int64(x))`,
+	},
+	{
+		"int32",
+		"Int32",
+		"0",
+		`state.encodeInt(int64(x))`,
+	},
+	{
+		"int64",
+		"Int64",
+		"0",
+		`state.encodeInt(x)`,
+	},
+	{
+		"int8",
+		"Int8",
+		"0",
+		`state.encodeInt(int64(x))`,
+	},
+	{
+		"string",
+		"String",
+		`""`,
+		`state.encodeUint(uint64(len(x)))
+		state.b.WriteString(x)`,
+	},
+	{
+		"uint",
+		"Uint",
+		"0",
+		`state.encodeUint(uint64(x))`,
+	},
+	{
+		"uint16",
+		"Uint16",
+		"0",
+		`state.encodeUint(uint64(x))`,
+	},
+	{
+		"uint32",
+		"Uint32",
+		"0",
+		`state.encodeUint(uint64(x))`,
+	},
+	{
+		"uint64",
+		"Uint64",
+		"0",
+		`state.encodeUint(x)`,
+	},
+	{
+		"uintptr",
+		"Uintptr",
+		"0",
+		`state.encodeUint(uint64(x))`,
+	},
+	// uint8 Handled separately.
+}
+
+func main() {
+	log.SetFlags(0)
+	log.SetPrefix("encgen: ")
+	flag.Parse()
+	if flag.NArg() != 0 {
+		log.Fatal("usage: encgen [--output filename]")
+	}
+	var b bytes.Buffer
+	fmt.Fprintf(&b, "// Code generated by go run encgen.go -output %s; DO NOT EDIT.\n", *output)
+	fmt.Fprint(&b, header)
+	printMaps(&b, "Array")
+	fmt.Fprint(&b, "\n")
+	printMaps(&b, "Slice")
+	for _, t := range types {
+		fmt.Fprintf(&b, arrayHelper, t.lower, t.upper)
+		fmt.Fprintf(&b, sliceHelper, t.lower, t.upper, t.zero, t.encoder)
+	}
+	source, err := format.Source(b.Bytes())
+	if err != nil {
+		log.Fatal("source format error:", err)
+	}
+	fd, err := os.Create(*output)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if _, err := fd.Write(source); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func printMaps(b *bytes.Buffer, upperClass string) {
+	fmt.Fprintf(b, "var enc%sHelper = map[reflect.Kind]encHelper{\n", upperClass)
+	for _, t := range types {
+		fmt.Fprintf(b, "reflect.%s: enc%s%s,\n", t.upper, t.upper, upperClass)
+	}
+	fmt.Fprintf(b, "}\n")
+}
+
+const header = `
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import (
+	"reflect"
+)
+
+`
+
+const arrayHelper = `
+func enc%[2]sArray(state *encoderState, v reflect.Value) bool {
+	// Can only slice if it is addressable.
+	if !v.CanAddr() {
+		return false
+	}
+	return enc%[2]sSlice(state, v.Slice(0, v.Len()))
+}
+`
+
+const sliceHelper = `
+func enc%[2]sSlice(state *encoderState, v reflect.Value) bool {
+	slice, ok := v.Interface().([]%[1]s)
+	if !ok {
+		// It is kind %[1]s but not type %[1]s. TODO: We can handle this unsafely.
+		return false
+	}
+	for _, x := range slice {
+		if x != %[3]s || state.sendZero {
+			%[4]s
+		}
+	}
+	return true
+}
+`
diff --git a/contrib/go/_std_1.22/src/encoding/gob/encode.go b/contrib/go/_std_1.22/src/encoding/gob/encode.go
new file mode 100644
index 0000000000..c83071c717
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/encode.go
@@ -0,0 +1,670 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:generate go run encgen.go -output enc_helpers.go
+
+package gob
+
+import (
+	"encoding"
+	"encoding/binary"
+	"math"
+	"math/bits"
+	"reflect"
+	"sync"
+)
+
+const uint64Size = 8
+
+type encHelper func(state *encoderState, v reflect.Value) bool
+
+// encoderState is the global execution state of an instance of the encoder.
+// Field numbers are delta encoded and always increase. The field
+// number is initialized to -1 so 0 comes out as delta(1). A delta of
+// 0 terminates the structure.
+type encoderState struct {
+	enc      *Encoder
+	b        *encBuffer
+	sendZero bool                 // encoding an array element or map key/value pair; send zero values
+	fieldnum int                  // the last field number written.
+	buf      [1 + uint64Size]byte // buffer used by the encoder; here to avoid allocation.
+	next     *encoderState        // for free list
+}
+
+// encBuffer is an extremely simple, fast implementation of a write-only byte buffer.
+// It never returns a non-nil error, but Write returns an error value so it matches io.Writer.
+type encBuffer struct {
+	data    []byte
+	scratch [64]byte
+}
+
+var encBufferPool = sync.Pool{
+	New: func() any {
+		e := new(encBuffer)
+		e.data = e.scratch[0:0]
+		return e
+	},
+}
+
+func (e *encBuffer) writeByte(c byte) {
+	e.data = append(e.data, c)
+}
+
+func (e *encBuffer) Write(p []byte) (int, error) {
+	e.data = append(e.data, p...)
+	return len(p), nil
+}
+
+func (e *encBuffer) WriteString(s string) {
+	e.data = append(e.data, s...)
+}
+
+func (e *encBuffer) Len() int {
+	return len(e.data)
+}
+
+func (e *encBuffer) Bytes() []byte {
+	return e.data
+}
+
+func (e *encBuffer) Reset() {
+	if len(e.data) >= tooBig {
+		e.data = e.scratch[0:0]
+	} else {
+		e.data = e.data[0:0]
+	}
+}
+
+func (enc *Encoder) newEncoderState(b *encBuffer) *encoderState {
+	e := enc.freeList
+	if e == nil {
+		e = new(encoderState)
+		e.enc = enc
+	} else {
+		enc.freeList = e.next
+	}
+	e.sendZero = false
+	e.fieldnum = 0
+	e.b = b
+	if len(b.data) == 0 {
+		b.data = b.scratch[0:0]
+	}
+	return e
+}
+
+func (enc *Encoder) freeEncoderState(e *encoderState) {
+	e.next = enc.freeList
+	enc.freeList = e
+}
+
+// Unsigned integers have a two-state encoding. If the number is less
+// than 128 (0 through 0x7F), its value is written directly.
+// Otherwise the value is written in big-endian byte order preceded
+// by the byte length, negated.
+
+// encodeUint writes an encoded unsigned integer to state.b.
+func (state *encoderState) encodeUint(x uint64) {
+	if x <= 0x7F {
+		state.b.writeByte(uint8(x))
+		return
+	}
+
+	binary.BigEndian.PutUint64(state.buf[1:], x)
+	bc := bits.LeadingZeros64(x) >> 3      // 8 - bytelen(x)
+	state.buf[bc] = uint8(bc - uint64Size) // and then we subtract 8 to get -bytelen(x)
+
+	state.b.Write(state.buf[bc : uint64Size+1])
+}
+
+// encodeInt writes an encoded signed integer to state.w.
+// The low bit of the encoding says whether to bit complement the (other bits of the)
+// uint to recover the int.
+func (state *encoderState) encodeInt(i int64) {
+	var x uint64
+	if i < 0 {
+		x = uint64(^i<<1) | 1
+	} else {
+		x = uint64(i << 1)
+	}
+	state.encodeUint(x)
+}
+
+// encOp is the signature of an encoding operator for a given type.
+type encOp func(i *encInstr, state *encoderState, v reflect.Value)
+
+// The 'instructions' of the encoding machine
+type encInstr struct {
+	op    encOp
+	field int   // field number in input
+	index []int // struct index
+	indir int   // how many pointer indirections to reach the value in the struct
+}
+
+// update emits a field number and updates the state to record its value for delta encoding.
+// If the instruction pointer is nil, it does nothing
+func (state *encoderState) update(instr *encInstr) {
+	if instr != nil {
+		state.encodeUint(uint64(instr.field - state.fieldnum))
+		state.fieldnum = instr.field
+	}
+}
+
+// Each encoder for a composite is responsible for handling any
+// indirections associated with the elements of the data structure.
+// If any pointer so reached is nil, no bytes are written. If the
+// data item is zero, no bytes are written. Single values - ints,
+// strings etc. - are indirected before calling their encoders.
+// Otherwise, the output (for a scalar) is the field number, as an
+// encoded integer, followed by the field data in its appropriate
+// format.
+
+// encIndirect dereferences pv indir times and returns the result.
+func encIndirect(pv reflect.Value, indir int) reflect.Value {
+	for ; indir > 0; indir-- {
+		if pv.IsNil() {
+			break
+		}
+		pv = pv.Elem()
+	}
+	return pv
+}
+
+// encBool encodes the bool referenced by v as an unsigned 0 or 1.
+func encBool(i *encInstr, state *encoderState, v reflect.Value) {
+	b := v.Bool()
+	if b || state.sendZero {
+		state.update(i)
+		if b {
+			state.encodeUint(1)
+		} else {
+			state.encodeUint(0)
+		}
+	}
+}
+
+// encInt encodes the signed integer (int int8 int16 int32 int64) referenced by v.
+func encInt(i *encInstr, state *encoderState, v reflect.Value) {
+	value := v.Int()
+	if value != 0 || state.sendZero {
+		state.update(i)
+		state.encodeInt(value)
+	}
+}
+
+// encUint encodes the unsigned integer (uint uint8 uint16 uint32 uint64 uintptr) referenced by v.
+func encUint(i *encInstr, state *encoderState, v reflect.Value) {
+	value := v.Uint()
+	if value != 0 || state.sendZero {
+		state.update(i)
+		state.encodeUint(value)
+	}
+}
+
+// floatBits returns a uint64 holding the bits of a floating-point number.
+// Floating-point numbers are transmitted as uint64s holding the bits
+// of the underlying representation. They are sent byte-reversed, with
+// the exponent end coming out first, so integer floating point numbers
+// (for example) transmit more compactly. This routine does the
+// swizzling.
+func floatBits(f float64) uint64 {
+	u := math.Float64bits(f)
+	return bits.ReverseBytes64(u)
+}
+
+// encFloat encodes the floating point value (float32 float64) referenced by v.
+func encFloat(i *encInstr, state *encoderState, v reflect.Value) {
+	f := v.Float()
+	if f != 0 || state.sendZero {
+		bits := floatBits(f)
+		state.update(i)
+		state.encodeUint(bits)
+	}
+}
+
+// encComplex encodes the complex value (complex64 complex128) referenced by v.
+// Complex numbers are just a pair of floating-point numbers, real part first.
+func encComplex(i *encInstr, state *encoderState, v reflect.Value) {
+	c := v.Complex()
+	if c != 0+0i || state.sendZero {
+		rpart := floatBits(real(c))
+		ipart := floatBits(imag(c))
+		state.update(i)
+		state.encodeUint(rpart)
+		state.encodeUint(ipart)
+	}
+}
+
+// encUint8Array encodes the byte array referenced by v.
+// Byte arrays are encoded as an unsigned count followed by the raw bytes.
+func encUint8Array(i *encInstr, state *encoderState, v reflect.Value) {
+	b := v.Bytes()
+	if len(b) > 0 || state.sendZero {
+		state.update(i)
+		state.encodeUint(uint64(len(b)))
+		state.b.Write(b)
+	}
+}
+
+// encString encodes the string referenced by v.
+// Strings are encoded as an unsigned count followed by the raw bytes.
+func encString(i *encInstr, state *encoderState, v reflect.Value) {
+	s := v.String()
+	if len(s) > 0 || state.sendZero {
+		state.update(i)
+		state.encodeUint(uint64(len(s)))
+		state.b.WriteString(s)
+	}
+}
+
+// encStructTerminator encodes the end of an encoded struct
+// as delta field number of 0.
+func encStructTerminator(i *encInstr, state *encoderState, v reflect.Value) {
+	state.encodeUint(0)
+}
+
+// Execution engine
+
+// encEngine an array of instructions indexed by field number of the encoding
+// data, typically a struct. It is executed top to bottom, walking the struct.
+type encEngine struct {
+	instr []encInstr
+}
+
+const singletonField = 0
+
+// valid reports whether the value is valid and a non-nil pointer.
+// (Slices, maps, and chans take care of themselves.)
+func valid(v reflect.Value) bool {
+	switch v.Kind() {
+	case reflect.Invalid:
+		return false
+	case reflect.Pointer:
+		return !v.IsNil()
+	}
+	return true
+}
+
+// encodeSingle encodes a single top-level non-struct value.
+func (enc *Encoder) encodeSingle(b *encBuffer, engine *encEngine, value reflect.Value) {
+	state := enc.newEncoderState(b)
+	defer enc.freeEncoderState(state)
+	state.fieldnum = singletonField
+	// There is no surrounding struct to frame the transmission, so we must
+	// generate data even if the item is zero. To do this, set sendZero.
+	state.sendZero = true
+	instr := &engine.instr[singletonField]
+	if instr.indir > 0 {
+		value = encIndirect(value, instr.indir)
+	}
+	if valid(value) {
+		instr.op(instr, state, value)
+	}
+}
+
+// encodeStruct encodes a single struct value.
+func (enc *Encoder) encodeStruct(b *encBuffer, engine *encEngine, value reflect.Value) {
+	if !valid(value) {
+		return
+	}
+	state := enc.newEncoderState(b)
+	defer enc.freeEncoderState(state)
+	state.fieldnum = -1
+	for i := 0; i < len(engine.instr); i++ {
+		instr := &engine.instr[i]
+		if i >= value.NumField() {
+			// encStructTerminator
+			instr.op(instr, state, reflect.Value{})
+			break
+		}
+		field := value.FieldByIndex(instr.index)
+		if instr.indir > 0 {
+			field = encIndirect(field, instr.indir)
+			// TODO: Is field guaranteed valid? If so we could avoid this check.
+			if !valid(field) {
+				continue
+			}
+		}
+		instr.op(instr, state, field)
+	}
+}
+
+// encodeArray encodes an array.
+func (enc *Encoder) encodeArray(b *encBuffer, value reflect.Value, op encOp, elemIndir int, length int, helper encHelper) {
+	state := enc.newEncoderState(b)
+	defer enc.freeEncoderState(state)
+	state.fieldnum = -1
+	state.sendZero = true
+	state.encodeUint(uint64(length))
+	if helper != nil && helper(state, value) {
+		return
+	}
+	for i := 0; i < length; i++ {
+		elem := value.Index(i)
+		if elemIndir > 0 {
+			elem = encIndirect(elem, elemIndir)
+			// TODO: Is elem guaranteed valid? If so we could avoid this check.
+			if !valid(elem) {
+				errorf("encodeArray: nil element")
+			}
+		}
+		op(nil, state, elem)
+	}
+}
+
+// encodeReflectValue is a helper for maps. It encodes the value v.
+func encodeReflectValue(state *encoderState, v reflect.Value, op encOp, indir int) {
+	for i := 0; i < indir && v.IsValid(); i++ {
+		v = reflect.Indirect(v)
+	}
+	if !v.IsValid() {
+		errorf("encodeReflectValue: nil element")
+	}
+	op(nil, state, v)
+}
+
+// encodeMap encodes a map as unsigned count followed by key:value pairs.
+func (enc *Encoder) encodeMap(b *encBuffer, mv reflect.Value, keyOp, elemOp encOp, keyIndir, elemIndir int) {
+	state := enc.newEncoderState(b)
+	state.fieldnum = -1
+	state.sendZero = true
+	state.encodeUint(uint64(mv.Len()))
+	mi := mv.MapRange()
+	for mi.Next() {
+		encodeReflectValue(state, mi.Key(), keyOp, keyIndir)
+		encodeReflectValue(state, mi.Value(), elemOp, elemIndir)
+	}
+	enc.freeEncoderState(state)
+}
+
+// encodeInterface encodes the interface value iv.
+// To send an interface, we send a string identifying the concrete type, followed
+// by the type identifier (which might require defining that type right now), followed
+// by the concrete value. A nil value gets sent as the empty string for the name,
+// followed by no value.
+func (enc *Encoder) encodeInterface(b *encBuffer, iv reflect.Value) {
+	// Gobs can encode nil interface values but not typed interface
+	// values holding nil pointers, since nil pointers point to no value.
+	elem := iv.Elem()
+	if elem.Kind() == reflect.Pointer && elem.IsNil() {
+		errorf("gob: cannot encode nil pointer of type %s inside interface", iv.Elem().Type())
+	}
+	state := enc.newEncoderState(b)
+	state.fieldnum = -1
+	state.sendZero = true
+	if iv.IsNil() {
+		state.encodeUint(0)
+		return
+	}
+
+	ut := userType(iv.Elem().Type())
+	namei, ok := concreteTypeToName.Load(ut.base)
+	if !ok {
+		errorf("type not registered for interface: %s", ut.base)
+	}
+	name := namei.(string)
+
+	// Send the name.
+	state.encodeUint(uint64(len(name)))
+	state.b.WriteString(name)
+	// Define the type id if necessary.
+	enc.sendTypeDescriptor(enc.writer(), state, ut)
+	// Send the type id.
+	enc.sendTypeId(state, ut)
+	// Encode the value into a new buffer. Any nested type definitions
+	// should be written to b, before the encoded value.
+	enc.pushWriter(b)
+	data := encBufferPool.Get().(*encBuffer)
+	data.Write(spaceForLength)
+	enc.encode(data, elem, ut)
+	if enc.err != nil {
+		error_(enc.err)
+	}
+	enc.popWriter()
+	enc.writeMessage(b, data)
+	data.Reset()
+	encBufferPool.Put(data)
+	if enc.err != nil {
+		error_(enc.err)
+	}
+	enc.freeEncoderState(state)
+}
+
+// encodeGobEncoder encodes a value that implements the GobEncoder interface.
+// The data is sent as a byte array.
+func (enc *Encoder) encodeGobEncoder(b *encBuffer, ut *userTypeInfo, v reflect.Value) {
+	// TODO: should we catch panics from the called method?
+
+	var data []byte
+	var err error
+	// We know it's one of these.
+	switch ut.externalEnc {
+	case xGob:
+		data, err = v.Interface().(GobEncoder).GobEncode()
+	case xBinary:
+		data, err = v.Interface().(encoding.BinaryMarshaler).MarshalBinary()
+	case xText:
+		data, err = v.Interface().(encoding.TextMarshaler).MarshalText()
+	}
+	if err != nil {
+		error_(err)
+	}
+	state := enc.newEncoderState(b)
+	state.fieldnum = -1
+	state.encodeUint(uint64(len(data)))
+	state.b.Write(data)
+	enc.freeEncoderState(state)
+}
+
+var encOpTable = [...]encOp{
+	reflect.Bool:       encBool,
+	reflect.Int:        encInt,
+	reflect.Int8:       encInt,
+	reflect.Int16:      encInt,
+	reflect.Int32:      encInt,
+	reflect.Int64:      encInt,
+	reflect.Uint:       encUint,
+	reflect.Uint8:      encUint,
+	reflect.Uint16:     encUint,
+	reflect.Uint32:     encUint,
+	reflect.Uint64:     encUint,
+	reflect.Uintptr:    encUint,
+	reflect.Float32:    encFloat,
+	reflect.Float64:    encFloat,
+	reflect.Complex64:  encComplex,
+	reflect.Complex128: encComplex,
+	reflect.String:     encString,
+}
+
+// encOpFor returns (a pointer to) the encoding op for the base type under rt and
+// the indirection count to reach it.
+func encOpFor(rt reflect.Type, inProgress map[reflect.Type]*encOp, building map[*typeInfo]bool) (*encOp, int) {
+	ut := userType(rt)
+	// If the type implements GobEncoder, we handle it without further processing.
+	if ut.externalEnc != 0 {
+		return gobEncodeOpFor(ut)
+	}
+	// If this type is already in progress, it's a recursive type (e.g. map[string]*T).
+	// Return the pointer to the op we're already building.
+	if opPtr := inProgress[rt]; opPtr != nil {
+		return opPtr, ut.indir
+	}
+	typ := ut.base
+	indir := ut.indir
+	k := typ.Kind()
+	var op encOp
+	if int(k) < len(encOpTable) {
+		op = encOpTable[k]
+	}
+	if op == nil {
+		inProgress[rt] = &op
+		// Special cases
+		switch t := typ; t.Kind() {
+		case reflect.Slice:
+			if t.Elem().Kind() == reflect.Uint8 {
+				op = encUint8Array
+				break
+			}
+			// Slices have a header; we decode it to find the underlying array.
+			elemOp, elemIndir := encOpFor(t.Elem(), inProgress, building)
+			helper := encSliceHelper[t.Elem().Kind()]
+			op = func(i *encInstr, state *encoderState, slice reflect.Value) {
+				if !state.sendZero && slice.Len() == 0 {
+					return
+				}
+				state.update(i)
+				state.enc.encodeArray(state.b, slice, *elemOp, elemIndir, slice.Len(), helper)
+			}
+		case reflect.Array:
+			// True arrays have size in the type.
+			elemOp, elemIndir := encOpFor(t.Elem(), inProgress, building)
+			helper := encArrayHelper[t.Elem().Kind()]
+			op = func(i *encInstr, state *encoderState, array reflect.Value) {
+				state.update(i)
+				state.enc.encodeArray(state.b, array, *elemOp, elemIndir, array.Len(), helper)
+			}
+		case reflect.Map:
+			keyOp, keyIndir := encOpFor(t.Key(), inProgress, building)
+			elemOp, elemIndir := encOpFor(t.Elem(), inProgress, building)
+			op = func(i *encInstr, state *encoderState, mv reflect.Value) {
+				// We send zero-length (but non-nil) maps because the
+				// receiver might want to use the map.  (Maps don't use append.)
+				if !state.sendZero && mv.IsNil() {
+					return
+				}
+				state.update(i)
+				state.enc.encodeMap(state.b, mv, *keyOp, *elemOp, keyIndir, elemIndir)
+			}
+		case reflect.Struct:
+			// Generate a closure that calls out to the engine for the nested type.
+			getEncEngine(userType(typ), building)
+			info := mustGetTypeInfo(typ)
+			op = func(i *encInstr, state *encoderState, sv reflect.Value) {
+				state.update(i)
+				// indirect through info to delay evaluation for recursive structs
+				enc := info.encoder.Load()
+				state.enc.encodeStruct(state.b, enc, sv)
+			}
+		case reflect.Interface:
+			op = func(i *encInstr, state *encoderState, iv reflect.Value) {
+				if !state.sendZero && (!iv.IsValid() || iv.IsNil()) {
+					return
+				}
+				state.update(i)
+				state.enc.encodeInterface(state.b, iv)
+			}
+		}
+	}
+	if op == nil {
+		errorf("can't happen: encode type %s", rt)
+	}
+	return &op, indir
+}
+
+// gobEncodeOpFor returns the op for a type that is known to implement GobEncoder.
+func gobEncodeOpFor(ut *userTypeInfo) (*encOp, int) {
+	rt := ut.user
+	if ut.encIndir == -1 {
+		rt = reflect.PointerTo(rt)
+	} else if ut.encIndir > 0 {
+		for i := int8(0); i < ut.encIndir; i++ {
+			rt = rt.Elem()
+		}
+	}
+	var op encOp
+	op = func(i *encInstr, state *encoderState, v reflect.Value) {
+		if ut.encIndir == -1 {
+			// Need to climb up one level to turn value into pointer.
+			if !v.CanAddr() {
+				errorf("unaddressable value of type %s", rt)
+			}
+			v = v.Addr()
+		}
+		if !state.sendZero && v.IsZero() {
+			return
+		}
+		state.update(i)
+		state.enc.encodeGobEncoder(state.b, ut, v)
+	}
+	return &op, int(ut.encIndir) // encIndir: op will get called with p == address of receiver.
+}
+
+// compileEnc returns the engine to compile the type.
+func compileEnc(ut *userTypeInfo, building map[*typeInfo]bool) *encEngine {
+	srt := ut.base
+	engine := new(encEngine)
+	seen := make(map[reflect.Type]*encOp)
+	rt := ut.base
+	if ut.externalEnc != 0 {
+		rt = ut.user
+	}
+	if ut.externalEnc == 0 && srt.Kind() == reflect.Struct {
+		for fieldNum, wireFieldNum := 0, 0; fieldNum < srt.NumField(); fieldNum++ {
+			f := srt.Field(fieldNum)
+			if !isSent(srt, &f) {
+				continue
+			}
+			op, indir := encOpFor(f.Type, seen, building)
+			engine.instr = append(engine.instr, encInstr{*op, wireFieldNum, f.Index, indir})
+			wireFieldNum++
+		}
+		if srt.NumField() > 0 && len(engine.instr) == 0 {
+			errorf("type %s has no exported fields", rt)
+		}
+		engine.instr = append(engine.instr, encInstr{encStructTerminator, 0, nil, 0})
+	} else {
+		engine.instr = make([]encInstr, 1)
+		op, indir := encOpFor(rt, seen, building)
+		engine.instr[0] = encInstr{*op, singletonField, nil, indir}
+	}
+	return engine
+}
+
+// getEncEngine returns the engine to compile the type.
+func getEncEngine(ut *userTypeInfo, building map[*typeInfo]bool) *encEngine {
+	info, err := getTypeInfo(ut)
+	if err != nil {
+		error_(err)
+	}
+	enc := info.encoder.Load()
+	if enc == nil {
+		enc = buildEncEngine(info, ut, building)
+	}
+	return enc
+}
+
+func buildEncEngine(info *typeInfo, ut *userTypeInfo, building map[*typeInfo]bool) *encEngine {
+	// Check for recursive types.
+	if building != nil && building[info] {
+		return nil
+	}
+	info.encInit.Lock()
+	defer info.encInit.Unlock()
+	enc := info.encoder.Load()
+	if enc == nil {
+		if building == nil {
+			building = make(map[*typeInfo]bool)
+		}
+		building[info] = true
+		enc = compileEnc(ut, building)
+		info.encoder.Store(enc)
+	}
+	return enc
+}
+
+func (enc *Encoder) encode(b *encBuffer, value reflect.Value, ut *userTypeInfo) {
+	defer catchError(&enc.err)
+	engine := getEncEngine(ut, nil)
+	indir := ut.indir
+	if ut.externalEnc != 0 {
+		indir = int(ut.encIndir)
+	}
+	for i := 0; i < indir; i++ {
+		value = reflect.Indirect(value)
+	}
+	if ut.externalEnc == 0 && value.Type().Kind() == reflect.Struct {
+		enc.encodeStruct(b, engine, value)
+	} else {
+		enc.encodeSingle(b, engine, value)
+	}
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/encoder.go b/contrib/go/_std_1.22/src/encoding/gob/encoder.go
new file mode 100644
index 0000000000..7d46152aba
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/encoder.go
@@ -0,0 +1,258 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import (
+	"errors"
+	"io"
+	"reflect"
+	"sync"
+)
+
+// An Encoder manages the transmission of type and data information to the
+// other side of a connection.  It is safe for concurrent use by multiple
+// goroutines.
+type Encoder struct {
+	mutex      sync.Mutex              // each item must be sent atomically
+	w          []io.Writer             // where to send the data
+	sent       map[reflect.Type]typeId // which types we've already sent
+	countState *encoderState           // stage for writing counts
+	freeList   *encoderState           // list of free encoderStates; avoids reallocation
+	byteBuf    encBuffer               // buffer for top-level encoderState
+	err        error
+}
+
+// Before we encode a message, we reserve space at the head of the
+// buffer in which to encode its length. This means we can use the
+// buffer to assemble the message without another allocation.
+const maxLength = 9 // Maximum size of an encoded length.
+var spaceForLength = make([]byte, maxLength)
+
+// NewEncoder returns a new encoder that will transmit on the [io.Writer].
+func NewEncoder(w io.Writer) *Encoder {
+	enc := new(Encoder)
+	enc.w = []io.Writer{w}
+	enc.sent = make(map[reflect.Type]typeId)
+	enc.countState = enc.newEncoderState(new(encBuffer))
+	return enc
+}
+
+// writer returns the innermost writer the encoder is using.
+func (enc *Encoder) writer() io.Writer {
+	return enc.w[len(enc.w)-1]
+}
+
+// pushWriter adds a writer to the encoder.
+func (enc *Encoder) pushWriter(w io.Writer) {
+	enc.w = append(enc.w, w)
+}
+
+// popWriter pops the innermost writer.
+func (enc *Encoder) popWriter() {
+	enc.w = enc.w[0 : len(enc.w)-1]
+}
+
+func (enc *Encoder) setError(err error) {
+	if enc.err == nil { // remember the first.
+		enc.err = err
+	}
+}
+
+// writeMessage sends the data item preceded by an unsigned count of its length.
+func (enc *Encoder) writeMessage(w io.Writer, b *encBuffer) {
+	// Space has been reserved for the length at the head of the message.
+	// This is a little dirty: we grab the slice from the bytes.Buffer and massage
+	// it by hand.
+	message := b.Bytes()
+	messageLen := len(message) - maxLength
+	// Length cannot be bigger than the decoder can handle.
+	if messageLen >= tooBig {
+		enc.setError(errors.New("gob: encoder: message too big"))
+		return
+	}
+	// Encode the length.
+	enc.countState.b.Reset()
+	enc.countState.encodeUint(uint64(messageLen))
+	// Copy the length to be a prefix of the message.
+	offset := maxLength - enc.countState.b.Len()
+	copy(message[offset:], enc.countState.b.Bytes())
+	// Write the data.
+	_, err := w.Write(message[offset:])
+	// Drain the buffer and restore the space at the front for the count of the next message.
+	b.Reset()
+	b.Write(spaceForLength)
+	if err != nil {
+		enc.setError(err)
+	}
+}
+
+// sendActualType sends the requested type, without further investigation, unless
+// it's been sent before.
+func (enc *Encoder) sendActualType(w io.Writer, state *encoderState, ut *userTypeInfo, actual reflect.Type) (sent bool) {
+	if _, alreadySent := enc.sent[actual]; alreadySent {
+		return false
+	}
+	info, err := getTypeInfo(ut)
+	if err != nil {
+		enc.setError(err)
+		return
+	}
+	// Send the pair (-id, type)
+	// Id:
+	state.encodeInt(-int64(info.id))
+	// Type:
+	enc.encode(state.b, reflect.ValueOf(info.wire), wireTypeUserInfo)
+	enc.writeMessage(w, state.b)
+	if enc.err != nil {
+		return
+	}
+
+	// Remember we've sent this type, both what the user gave us and the base type.
+	enc.sent[ut.base] = info.id
+	if ut.user != ut.base {
+		enc.sent[ut.user] = info.id
+	}
+	// Now send the inner types
+	switch st := actual; st.Kind() {
+	case reflect.Struct:
+		for i := 0; i < st.NumField(); i++ {
+			if isExported(st.Field(i).Name) {
+				enc.sendType(w, state, st.Field(i).Type)
+			}
+		}
+	case reflect.Array, reflect.Slice:
+		enc.sendType(w, state, st.Elem())
+	case reflect.Map:
+		enc.sendType(w, state, st.Key())
+		enc.sendType(w, state, st.Elem())
+	}
+	return true
+}
+
+// sendType sends the type info to the other side, if necessary.
+func (enc *Encoder) sendType(w io.Writer, state *encoderState, origt reflect.Type) (sent bool) {
+	ut := userType(origt)
+	if ut.externalEnc != 0 {
+		// The rules are different: regardless of the underlying type's representation,
+		// we need to tell the other side that the base type is a GobEncoder.
+		return enc.sendActualType(w, state, ut, ut.base)
+	}
+
+	// It's a concrete value, so drill down to the base type.
+	switch rt := ut.base; rt.Kind() {
+	default:
+		// Basic types and interfaces do not need to be described.
+		return
+	case reflect.Slice:
+		// If it's []uint8, don't send; it's considered basic.
+		if rt.Elem().Kind() == reflect.Uint8 {
+			return
+		}
+		// Otherwise we do send.
+		break
+	case reflect.Array:
+		// arrays must be sent so we know their lengths and element types.
+		break
+	case reflect.Map:
+		// maps must be sent so we know their lengths and key/value types.
+		break
+	case reflect.Struct:
+		// structs must be sent so we know their fields.
+		break
+	case reflect.Chan, reflect.Func:
+		// If we get here, it's a field of a struct; ignore it.
+		return
+	}
+
+	return enc.sendActualType(w, state, ut, ut.base)
+}
+
+// Encode transmits the data item represented by the empty interface value,
+// guaranteeing that all necessary type information has been transmitted first.
+// Passing a nil pointer to Encoder will panic, as they cannot be transmitted by gob.
+func (enc *Encoder) Encode(e any) error {
+	return enc.EncodeValue(reflect.ValueOf(e))
+}
+
+// sendTypeDescriptor makes sure the remote side knows about this type.
+// It will send a descriptor if this is the first time the type has been
+// sent.
+func (enc *Encoder) sendTypeDescriptor(w io.Writer, state *encoderState, ut *userTypeInfo) {
+	// Make sure the type is known to the other side.
+	// First, have we already sent this type?
+	rt := ut.base
+	if ut.externalEnc != 0 {
+		rt = ut.user
+	}
+	if _, alreadySent := enc.sent[rt]; !alreadySent {
+		// No, so send it.
+		sent := enc.sendType(w, state, rt)
+		if enc.err != nil {
+			return
+		}
+		// If the type info has still not been transmitted, it means we have
+		// a singleton basic type (int, []byte etc.) at top level. We don't
+		// need to send the type info but we do need to update enc.sent.
+		if !sent {
+			info, err := getTypeInfo(ut)
+			if err != nil {
+				enc.setError(err)
+				return
+			}
+			enc.sent[rt] = info.id
+		}
+	}
+}
+
+// sendTypeId sends the id, which must have already been defined.
+func (enc *Encoder) sendTypeId(state *encoderState, ut *userTypeInfo) {
+	// Identify the type of this top-level value.
+	state.encodeInt(int64(enc.sent[ut.base]))
+}
+
+// EncodeValue transmits the data item represented by the reflection value,
+// guaranteeing that all necessary type information has been transmitted first.
+// Passing a nil pointer to EncodeValue will panic, as they cannot be transmitted by gob.
+func (enc *Encoder) EncodeValue(value reflect.Value) error {
+	if value.Kind() == reflect.Invalid {
+		return errors.New("gob: cannot encode nil value")
+	}
+	if value.Kind() == reflect.Pointer && value.IsNil() {
+		panic("gob: cannot encode nil pointer of type " + value.Type().String())
+	}
+
+	// Make sure we're single-threaded through here, so multiple
+	// goroutines can share an encoder.
+	enc.mutex.Lock()
+	defer enc.mutex.Unlock()
+
+	// Remove any nested writers remaining due to previous errors.
+	enc.w = enc.w[0:1]
+
+	ut, err := validUserType(value.Type())
+	if err != nil {
+		return err
+	}
+
+	enc.err = nil
+	enc.byteBuf.Reset()
+	enc.byteBuf.Write(spaceForLength)
+	state := enc.newEncoderState(&enc.byteBuf)
+
+	enc.sendTypeDescriptor(enc.writer(), state, ut)
+	enc.sendTypeId(state, ut)
+	if enc.err != nil {
+		return enc.err
+	}
+
+	// Encode the object.
+	enc.encode(state.b, value, ut)
+	if enc.err == nil {
+		enc.writeMessage(enc.writer(), state.b)
+	}
+
+	enc.freeEncoderState(state)
+	return enc.err
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/error.go b/contrib/go/_std_1.22/src/encoding/gob/error.go
new file mode 100644
index 0000000000..9c614e3e3f
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/error.go
@@ -0,0 +1,42 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import "fmt"
+
+// Errors in decoding and encoding are handled using panic and recover.
+// Panics caused by user error (that is, everything except run-time panics
+// such as "index out of bounds" errors) do not leave the file that caused
+// them, but are instead turned into plain error returns. Encoding and
+// decoding functions and methods that do not return an error either use
+// panic to report an error or are guaranteed error-free.
+
+// A gobError is used to distinguish errors (panics) generated in this package.
+type gobError struct {
+	err error
+}
+
+// errorf is like error_ but takes Printf-style arguments to construct an error.
+// It always prefixes the message with "gob: ".
+func errorf(format string, args ...any) {
+	error_(fmt.Errorf("gob: "+format, args...))
+}
+
+// error_ wraps the argument error and uses it as the argument to panic.
+func error_(err error) {
+	panic(gobError{err})
+}
+
+// catchError is meant to be used as a deferred function to turn a panic(gobError) into a
+// plain error. It overwrites the error return of the function that deferred its call.
+func catchError(err *error) {
+	if e := recover(); e != nil {
+		ge, ok := e.(gobError)
+		if !ok {
+			panic(e)
+		}
+		*err = ge.err
+	}
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/type.go b/contrib/go/_std_1.22/src/encoding/gob/type.go
new file mode 100644
index 0000000000..3b1dde492c
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/type.go
@@ -0,0 +1,955 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gob
+
+import (
+	"encoding"
+	"errors"
+	"fmt"
+	"os"
+	"reflect"
+	"sync"
+	"sync/atomic"
+	"unicode"
+	"unicode/utf8"
+)
+
+// userTypeInfo stores the information associated with a type the user has handed
+// to the package. It's computed once and stored in a map keyed by reflection
+// type.
+type userTypeInfo struct {
+	user        reflect.Type // the type the user handed us
+	base        reflect.Type // the base type after all indirections
+	indir       int          // number of indirections to reach the base type
+	externalEnc int          // xGob, xBinary, or xText
+	externalDec int          // xGob, xBinary, or xText
+	encIndir    int8         // number of indirections to reach the receiver type; may be negative
+	decIndir    int8         // number of indirections to reach the receiver type; may be negative
+}
+
+// externalEncoding bits
+const (
+	xGob    = 1 + iota // GobEncoder or GobDecoder
+	xBinary            // encoding.BinaryMarshaler or encoding.BinaryUnmarshaler
+	xText              // encoding.TextMarshaler or encoding.TextUnmarshaler
+)
+
+var userTypeCache sync.Map // map[reflect.Type]*userTypeInfo
+
+// validUserType returns, and saves, the information associated with user-provided type rt.
+// If the user type is not valid, err will be non-nil. To be used when the error handler
+// is not set up.
+func validUserType(rt reflect.Type) (*userTypeInfo, error) {
+	if ui, ok := userTypeCache.Load(rt); ok {
+		return ui.(*userTypeInfo), nil
+	}
+
+	// Construct a new userTypeInfo and atomically add it to the userTypeCache.
+	// If we lose the race, we'll waste a little CPU and create a little garbage
+	// but return the existing value anyway.
+
+	ut := new(userTypeInfo)
+	ut.base = rt
+	ut.user = rt
+	// A type that is just a cycle of pointers (such as type T *T) cannot
+	// be represented in gobs, which need some concrete data. We use a
+	// cycle detection algorithm from Knuth, Vol 2, Section 3.1, Ex 6,
+	// pp 539-540.  As we step through indirections, run another type at
+	// half speed. If they meet up, there's a cycle.
+	slowpoke := ut.base // walks half as fast as ut.base
+	for {
+		pt := ut.base
+		if pt.Kind() != reflect.Pointer {
+			break
+		}
+		ut.base = pt.Elem()
+		if ut.base == slowpoke { // ut.base lapped slowpoke
+			// recursive pointer type.
+			return nil, errors.New("can't represent recursive pointer type " + ut.base.String())
+		}
+		if ut.indir%2 == 0 {
+			slowpoke = slowpoke.Elem()
+		}
+		ut.indir++
+	}
+
+	if ok, indir := implementsInterface(ut.user, gobEncoderInterfaceType); ok {
+		ut.externalEnc, ut.encIndir = xGob, indir
+	} else if ok, indir := implementsInterface(ut.user, binaryMarshalerInterfaceType); ok {
+		ut.externalEnc, ut.encIndir = xBinary, indir
+	}
+
+	// NOTE(rsc): Would like to allow MarshalText here, but results in incompatibility
+	// with older encodings for net.IP. See golang.org/issue/6760.
+	// } else if ok, indir := implementsInterface(ut.user, textMarshalerInterfaceType); ok {
+	// 	ut.externalEnc, ut.encIndir = xText, indir
+	// }
+
+	if ok, indir := implementsInterface(ut.user, gobDecoderInterfaceType); ok {
+		ut.externalDec, ut.decIndir = xGob, indir
+	} else if ok, indir := implementsInterface(ut.user, binaryUnmarshalerInterfaceType); ok {
+		ut.externalDec, ut.decIndir = xBinary, indir
+	}
+
+	// See note above.
+	// } else if ok, indir := implementsInterface(ut.user, textUnmarshalerInterfaceType); ok {
+	// 	ut.externalDec, ut.decIndir = xText, indir
+	// }
+
+	ui, _ := userTypeCache.LoadOrStore(rt, ut)
+	return ui.(*userTypeInfo), nil
+}
+
+var (
+	gobEncoderInterfaceType        = reflect.TypeFor[GobEncoder]()
+	gobDecoderInterfaceType        = reflect.TypeFor[GobDecoder]()
+	binaryMarshalerInterfaceType   = reflect.TypeFor[encoding.BinaryMarshaler]()
+	binaryUnmarshalerInterfaceType = reflect.TypeFor[encoding.BinaryUnmarshaler]()
+	textMarshalerInterfaceType     = reflect.TypeFor[encoding.TextMarshaler]()
+	textUnmarshalerInterfaceType   = reflect.TypeFor[encoding.TextUnmarshaler]()
+
+	wireTypeType = reflect.TypeFor[wireType]()
+)
+
+// implementsInterface reports whether the type implements the
+// gobEncoder/gobDecoder interface.
+// It also returns the number of indirections required to get to the
+// implementation.
+func implementsInterface(typ, gobEncDecType reflect.Type) (success bool, indir int8) {
+	if typ == nil {
+		return
+	}
+	rt := typ
+	// The type might be a pointer and we need to keep
+	// dereferencing to the base type until we find an implementation.
+	for {
+		if rt.Implements(gobEncDecType) {
+			return true, indir
+		}
+		if p := rt; p.Kind() == reflect.Pointer {
+			indir++
+			if indir > 100 { // insane number of indirections
+				return false, 0
+			}
+			rt = p.Elem()
+			continue
+		}
+		break
+	}
+	// No luck yet, but if this is a base type (non-pointer), the pointer might satisfy.
+	if typ.Kind() != reflect.Pointer {
+		// Not a pointer, but does the pointer work?
+		if reflect.PointerTo(typ).Implements(gobEncDecType) {
+			return true, -1
+		}
+	}
+	return false, 0
+}
+
+// userType returns, and saves, the information associated with user-provided type rt.
+// If the user type is not valid, it calls error.
+func userType(rt reflect.Type) *userTypeInfo {
+	ut, err := validUserType(rt)
+	if err != nil {
+		error_(err)
+	}
+	return ut
+}
+
+// A typeId represents a gob Type as an integer that can be passed on the wire.
+// Internally, typeIds are used as keys to a map to recover the underlying type info.
+type typeId int32
+
+var typeLock sync.Mutex // set while building a type
+const firstUserId = 64  // lowest id number granted to user
+
+type gobType interface {
+	id() typeId
+	setId(id typeId)
+	name() string
+	string() string // not public; only for debugging
+	safeString(seen map[typeId]bool) string
+}
+
+var (
+	types                = make(map[reflect.Type]gobType, 32)
+	idToTypeSlice        = make([]gobType, 1, firstUserId)
+	builtinIdToTypeSlice [firstUserId]gobType // set in init() after builtins are established
+)
+
+func idToType(id typeId) gobType {
+	if id < 0 || int(id) >= len(idToTypeSlice) {
+		return nil
+	}
+	return idToTypeSlice[id]
+}
+
+func builtinIdToType(id typeId) gobType {
+	if id < 0 || int(id) >= len(builtinIdToTypeSlice) {
+		return nil
+	}
+	return builtinIdToTypeSlice[id]
+}
+
+func setTypeId(typ gobType) {
+	// When building recursive types, someone may get there before us.
+	if typ.id() != 0 {
+		return
+	}
+	nextId := typeId(len(idToTypeSlice))
+	typ.setId(nextId)
+	idToTypeSlice = append(idToTypeSlice, typ)
+}
+
+func (t typeId) gobType() gobType {
+	if t == 0 {
+		return nil
+	}
+	return idToType(t)
+}
+
+// string returns the string representation of the type associated with the typeId.
+func (t typeId) string() string {
+	if t.gobType() == nil {
+		return "<nil>"
+	}
+	return t.gobType().string()
+}
+
+// Name returns the name of the type associated with the typeId.
+func (t typeId) name() string {
+	if t.gobType() == nil {
+		return "<nil>"
+	}
+	return t.gobType().name()
+}
+
+// CommonType holds elements of all types.
+// It is a historical artifact, kept for binary compatibility and exported
+// only for the benefit of the package's encoding of type descriptors. It is
+// not intended for direct use by clients.
+type CommonType struct {
+	Name string
+	Id   typeId
+}
+
+func (t *CommonType) id() typeId { return t.Id }
+
+func (t *CommonType) setId(id typeId) { t.Id = id }
+
+func (t *CommonType) string() string { return t.Name }
+
+func (t *CommonType) safeString(seen map[typeId]bool) string {
+	return t.Name
+}
+
+func (t *CommonType) name() string { return t.Name }
+
+// Create and check predefined types
+// The string for tBytes is "bytes" not "[]byte" to signify its specialness.
+
+var (
+	// Primordial types, needed during initialization.
+	// Always passed as pointers so the interface{} type
+	// goes through without losing its interfaceness.
+	tBool      = bootstrapType("bool", (*bool)(nil))
+	tInt       = bootstrapType("int", (*int)(nil))
+	tUint      = bootstrapType("uint", (*uint)(nil))
+	tFloat     = bootstrapType("float", (*float64)(nil))
+	tBytes     = bootstrapType("bytes", (*[]byte)(nil))
+	tString    = bootstrapType("string", (*string)(nil))
+	tComplex   = bootstrapType("complex", (*complex128)(nil))
+	tInterface = bootstrapType("interface", (*any)(nil))
+	// Reserve some Ids for compatible expansion
+	tReserved7 = bootstrapType("_reserved1", (*struct{ r7 int })(nil))
+	tReserved6 = bootstrapType("_reserved1", (*struct{ r6 int })(nil))
+	tReserved5 = bootstrapType("_reserved1", (*struct{ r5 int })(nil))
+	tReserved4 = bootstrapType("_reserved1", (*struct{ r4 int })(nil))
+	tReserved3 = bootstrapType("_reserved1", (*struct{ r3 int })(nil))
+	tReserved2 = bootstrapType("_reserved1", (*struct{ r2 int })(nil))
+	tReserved1 = bootstrapType("_reserved1", (*struct{ r1 int })(nil))
+)
+
+// Predefined because it's needed by the Decoder
+var tWireType = mustGetTypeInfo(wireTypeType).id
+var wireTypeUserInfo *userTypeInfo // userTypeInfo of wireType
+
+func init() {
+	// Some magic numbers to make sure there are no surprises.
+	checkId(16, tWireType)
+	checkId(17, mustGetTypeInfo(reflect.TypeFor[arrayType]()).id)
+	checkId(18, mustGetTypeInfo(reflect.TypeFor[CommonType]()).id)
+	checkId(19, mustGetTypeInfo(reflect.TypeFor[sliceType]()).id)
+	checkId(20, mustGetTypeInfo(reflect.TypeFor[structType]()).id)
+	checkId(21, mustGetTypeInfo(reflect.TypeFor[fieldType]()).id)
+	checkId(23, mustGetTypeInfo(reflect.TypeFor[mapType]()).id)
+
+	copy(builtinIdToTypeSlice[:], idToTypeSlice)
+
+	// Move the id space upwards to allow for growth in the predefined world
+	// without breaking existing files.
+	if nextId := len(idToTypeSlice); nextId > firstUserId {
+		panic(fmt.Sprintln("nextId too large:", nextId))
+	}
+	idToTypeSlice = idToTypeSlice[:firstUserId]
+	registerBasics()
+	wireTypeUserInfo = userType(wireTypeType)
+}
+
+// Array type
+type arrayType struct {
+	CommonType
+	Elem typeId
+	Len  int
+}
+
+func newArrayType(name string) *arrayType {
+	a := &arrayType{CommonType{Name: name}, 0, 0}
+	return a
+}
+
+func (a *arrayType) init(elem gobType, len int) {
+	// Set our type id before evaluating the element's, in case it's our own.
+	setTypeId(a)
+	a.Elem = elem.id()
+	a.Len = len
+}
+
+func (a *arrayType) safeString(seen map[typeId]bool) string {
+	if seen[a.Id] {
+		return a.Name
+	}
+	seen[a.Id] = true
+	return fmt.Sprintf("[%d]%s", a.Len, a.Elem.gobType().safeString(seen))
+}
+
+func (a *arrayType) string() string { return a.safeString(make(map[typeId]bool)) }
+
+// GobEncoder type (something that implements the GobEncoder interface)
+type gobEncoderType struct {
+	CommonType
+}
+
+func newGobEncoderType(name string) *gobEncoderType {
+	g := &gobEncoderType{CommonType{Name: name}}
+	setTypeId(g)
+	return g
+}
+
+func (g *gobEncoderType) safeString(seen map[typeId]bool) string {
+	return g.Name
+}
+
+func (g *gobEncoderType) string() string { return g.Name }
+
+// Map type
+type mapType struct {
+	CommonType
+	Key  typeId
+	Elem typeId
+}
+
+func newMapType(name string) *mapType {
+	m := &mapType{CommonType{Name: name}, 0, 0}
+	return m
+}
+
+func (m *mapType) init(key, elem gobType) {
+	// Set our type id before evaluating the element's, in case it's our own.
+	setTypeId(m)
+	m.Key = key.id()
+	m.Elem = elem.id()
+}
+
+func (m *mapType) safeString(seen map[typeId]bool) string {
+	if seen[m.Id] {
+		return m.Name
+	}
+	seen[m.Id] = true
+	key := m.Key.gobType().safeString(seen)
+	elem := m.Elem.gobType().safeString(seen)
+	return fmt.Sprintf("map[%s]%s", key, elem)
+}
+
+func (m *mapType) string() string { return m.safeString(make(map[typeId]bool)) }
+
+// Slice type
+type sliceType struct {
+	CommonType
+	Elem typeId
+}
+
+func newSliceType(name string) *sliceType {
+	s := &sliceType{CommonType{Name: name}, 0}
+	return s
+}
+
+func (s *sliceType) init(elem gobType) {
+	// Set our type id before evaluating the element's, in case it's our own.
+	setTypeId(s)
+	// See the comments about ids in newTypeObject. Only slices and
+	// structs have mutual recursion.
+	if elem.id() == 0 {
+		setTypeId(elem)
+	}
+	s.Elem = elem.id()
+}
+
+func (s *sliceType) safeString(seen map[typeId]bool) string {
+	if seen[s.Id] {
+		return s.Name
+	}
+	seen[s.Id] = true
+	return fmt.Sprintf("[]%s", s.Elem.gobType().safeString(seen))
+}
+
+func (s *sliceType) string() string { return s.safeString(make(map[typeId]bool)) }
+
+// Struct type
+type fieldType struct {
+	Name string
+	Id   typeId
+}
+
+type structType struct {
+	CommonType
+	Field []fieldType
+}
+
+func (s *structType) safeString(seen map[typeId]bool) string {
+	if s == nil {
+		return "<nil>"
+	}
+	if _, ok := seen[s.Id]; ok {
+		return s.Name
+	}
+	seen[s.Id] = true
+	str := s.Name + " = struct { "
+	for _, f := range s.Field {
+		str += fmt.Sprintf("%s %s; ", f.Name, f.Id.gobType().safeString(seen))
+	}
+	str += "}"
+	return str
+}
+
+func (s *structType) string() string { return s.safeString(make(map[typeId]bool)) }
+
+func newStructType(name string) *structType {
+	s := &structType{CommonType{Name: name}, nil}
+	// For historical reasons we set the id here rather than init.
+	// See the comment in newTypeObject for details.
+	setTypeId(s)
+	return s
+}
+
+// newTypeObject allocates a gobType for the reflection type rt.
+// Unless ut represents a GobEncoder, rt should be the base type
+// of ut.
+// This is only called from the encoding side. The decoding side
+// works through typeIds and userTypeInfos alone.
+func newTypeObject(name string, ut *userTypeInfo, rt reflect.Type) (gobType, error) {
+	// Does this type implement GobEncoder?
+	if ut.externalEnc != 0 {
+		return newGobEncoderType(name), nil
+	}
+	var err error
+	var type0, type1 gobType
+	defer func() {
+		if err != nil {
+			delete(types, rt)
+		}
+	}()
+	// Install the top-level type before the subtypes (e.g. struct before
+	// fields) so recursive types can be constructed safely.
+	switch t := rt; t.Kind() {
+	// All basic types are easy: they are predefined.
+	case reflect.Bool:
+		return tBool.gobType(), nil
+
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return tInt.gobType(), nil
+
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return tUint.gobType(), nil
+
+	case reflect.Float32, reflect.Float64:
+		return tFloat.gobType(), nil
+
+	case reflect.Complex64, reflect.Complex128:
+		return tComplex.gobType(), nil
+
+	case reflect.String:
+		return tString.gobType(), nil
+
+	case reflect.Interface:
+		return tInterface.gobType(), nil
+
+	case reflect.Array:
+		at := newArrayType(name)
+		types[rt] = at
+		type0, err = getBaseType("", t.Elem())
+		if err != nil {
+			return nil, err
+		}
+		// Historical aside:
+		// For arrays, maps, and slices, we set the type id after the elements
+		// are constructed. This is to retain the order of type id allocation after
+		// a fix made to handle recursive types, which changed the order in
+		// which types are built. Delaying the setting in this way preserves
+		// type ids while allowing recursive types to be described. Structs,
+		// done below, were already handling recursion correctly so they
+		// assign the top-level id before those of the field.
+		at.init(type0, t.Len())
+		return at, nil
+
+	case reflect.Map:
+		mt := newMapType(name)
+		types[rt] = mt
+		type0, err = getBaseType("", t.Key())
+		if err != nil {
+			return nil, err
+		}
+		type1, err = getBaseType("", t.Elem())
+		if err != nil {
+			return nil, err
+		}
+		mt.init(type0, type1)
+		return mt, nil
+
+	case reflect.Slice:
+		// []byte == []uint8 is a special case
+		if t.Elem().Kind() == reflect.Uint8 {
+			return tBytes.gobType(), nil
+		}
+		st := newSliceType(name)
+		types[rt] = st
+		type0, err = getBaseType(t.Elem().Name(), t.Elem())
+		if err != nil {
+			return nil, err
+		}
+		st.init(type0)
+		return st, nil
+
+	case reflect.Struct:
+		st := newStructType(name)
+		types[rt] = st
+		idToTypeSlice[st.id()] = st
+		for i := 0; i < t.NumField(); i++ {
+			f := t.Field(i)
+			if !isSent(t, &f) {
+				continue
+			}
+			typ := userType(f.Type).base
+			tname := typ.Name()
+			if tname == "" {
+				t := userType(f.Type).base
+				tname = t.String()
+			}
+			gt, err := getBaseType(tname, f.Type)
+			if err != nil {
+				return nil, err
+			}
+			// Some mutually recursive types can cause us to be here while
+			// still defining the element. Fix the element type id here.
+			// We could do this more neatly by setting the id at the start of
+			// building every type, but that would break binary compatibility.
+			if gt.id() == 0 {
+				setTypeId(gt)
+			}
+			st.Field = append(st.Field, fieldType{f.Name, gt.id()})
+		}
+		return st, nil
+
+	default:
+		return nil, errors.New("gob NewTypeObject can't handle type: " + rt.String())
+	}
+}
+
+// isExported reports whether this is an exported - upper case - name.
+func isExported(name string) bool {
+	rune, _ := utf8.DecodeRuneInString(name)
+	return unicode.IsUpper(rune)
+}
+
+// isSent reports whether this struct field is to be transmitted.
+// It will be transmitted only if it is exported and not a chan or func field
+// or pointer to chan or func.
+func isSent(struct_ reflect.Type, field *reflect.StructField) bool {
+	if !isExported(field.Name) {
+		return false
+	}
+	// If the field is a chan or func or pointer thereto, don't send it.
+	// That is, treat it like an unexported field.
+	typ := field.Type
+	for typ.Kind() == reflect.Pointer {
+		typ = typ.Elem()
+	}
+	if typ.Kind() == reflect.Chan || typ.Kind() == reflect.Func {
+		return false
+	}
+
+	// Special case for Go 1.22: the x509.Certificate.Policies
+	// field is unencodable but also unused by default.
+	// Ignore it, so that x509.Certificate continues to be encodeable.
+	// Go 1.23 will add the right methods so that gob can
+	// handle the Policies field, and then we can remove this check.
+	// See go.dev/issue/65633.
+	if field.Name == "Policies" && struct_.PkgPath() == "crypto/x509" && struct_.Name() == "Certificate" {
+		return false
+	}
+
+	return true
+}
+
+// getBaseType returns the Gob type describing the given reflect.Type's base type.
+// typeLock must be held.
+func getBaseType(name string, rt reflect.Type) (gobType, error) {
+	ut := userType(rt)
+	return getType(name, ut, ut.base)
+}
+
+// getType returns the Gob type describing the given reflect.Type.
+// Should be called only when handling GobEncoders/Decoders,
+// which may be pointers. All other types are handled through the
+// base type, never a pointer.
+// typeLock must be held.
+func getType(name string, ut *userTypeInfo, rt reflect.Type) (gobType, error) {
+	typ, present := types[rt]
+	if present {
+		return typ, nil
+	}
+	typ, err := newTypeObject(name, ut, rt)
+	if err == nil {
+		types[rt] = typ
+	}
+	return typ, err
+}
+
+func checkId(want, got typeId) {
+	if want != got {
+		fmt.Fprintf(os.Stderr, "checkId: %d should be %d\n", int(got), int(want))
+		panic("bootstrap type wrong id: " + got.name() + " " + got.string() + " not " + want.string())
+	}
+}
+
+// used for building the basic types; called only from init().  the incoming
+// interface always refers to a pointer.
+func bootstrapType(name string, e any) typeId {
+	rt := reflect.TypeOf(e).Elem()
+	_, present := types[rt]
+	if present {
+		panic("bootstrap type already present: " + name + ", " + rt.String())
+	}
+	typ := &CommonType{Name: name}
+	types[rt] = typ
+	setTypeId(typ)
+	return typ.id()
+}
+
+// Representation of the information we send and receive about this type.
+// Each value we send is preceded by its type definition: an encoded int.
+// However, the very first time we send the value, we first send the pair
+// (-id, wireType).
+// For bootstrapping purposes, we assume that the recipient knows how
+// to decode a wireType; it is exactly the wireType struct here, interpreted
+// using the gob rules for sending a structure, except that we assume the
+// ids for wireType and structType etc. are known. The relevant pieces
+// are built in encode.go's init() function.
+// To maintain binary compatibility, if you extend this type, always put
+// the new fields last.
+type wireType struct {
+	ArrayT           *arrayType
+	SliceT           *sliceType
+	StructT          *structType
+	MapT             *mapType
+	GobEncoderT      *gobEncoderType
+	BinaryMarshalerT *gobEncoderType
+	TextMarshalerT   *gobEncoderType
+}
+
+func (w *wireType) string() string {
+	const unknown = "unknown type"
+	if w == nil {
+		return unknown
+	}
+	switch {
+	case w.ArrayT != nil:
+		return w.ArrayT.Name
+	case w.SliceT != nil:
+		return w.SliceT.Name
+	case w.StructT != nil:
+		return w.StructT.Name
+	case w.MapT != nil:
+		return w.MapT.Name
+	case w.GobEncoderT != nil:
+		return w.GobEncoderT.Name
+	case w.BinaryMarshalerT != nil:
+		return w.BinaryMarshalerT.Name
+	case w.TextMarshalerT != nil:
+		return w.TextMarshalerT.Name
+	}
+	return unknown
+}
+
+type typeInfo struct {
+	id      typeId
+	encInit sync.Mutex // protects creation of encoder
+	encoder atomic.Pointer[encEngine]
+	wire    wireType
+}
+
+// typeInfoMap is an atomic pointer to map[reflect.Type]*typeInfo.
+// It's updated copy-on-write. Readers just do an atomic load
+// to get the current version of the map. Writers make a full copy of
+// the map and atomically update the pointer to point to the new map.
+// Under heavy read contention, this is significantly faster than a map
+// protected by a mutex.
+var typeInfoMap atomic.Value
+
+// typeInfoMapInit is used instead of typeInfoMap during init time,
+// as types are registered sequentially during init and we can save
+// the overhead of making map copies.
+// It is saved to typeInfoMap and set to nil before init finishes.
+var typeInfoMapInit = make(map[reflect.Type]*typeInfo, 16)
+
+func lookupTypeInfo(rt reflect.Type) *typeInfo {
+	if m := typeInfoMapInit; m != nil {
+		return m[rt]
+	}
+	m, _ := typeInfoMap.Load().(map[reflect.Type]*typeInfo)
+	return m[rt]
+}
+
+func getTypeInfo(ut *userTypeInfo) (*typeInfo, error) {
+	rt := ut.base
+	if ut.externalEnc != 0 {
+		// We want the user type, not the base type.
+		rt = ut.user
+	}
+	if info := lookupTypeInfo(rt); info != nil {
+		return info, nil
+	}
+	return buildTypeInfo(ut, rt)
+}
+
+// buildTypeInfo constructs the type information for the type
+// and stores it in the type info map.
+func buildTypeInfo(ut *userTypeInfo, rt reflect.Type) (*typeInfo, error) {
+	typeLock.Lock()
+	defer typeLock.Unlock()
+
+	if info := lookupTypeInfo(rt); info != nil {
+		return info, nil
+	}
+
+	gt, err := getBaseType(rt.Name(), rt)
+	if err != nil {
+		return nil, err
+	}
+	info := &typeInfo{id: gt.id()}
+
+	if ut.externalEnc != 0 {
+		userType, err := getType(rt.Name(), ut, rt)
+		if err != nil {
+			return nil, err
+		}
+		gt := userType.id().gobType().(*gobEncoderType)
+		switch ut.externalEnc {
+		case xGob:
+			info.wire.GobEncoderT = gt
+		case xBinary:
+			info.wire.BinaryMarshalerT = gt
+		case xText:
+			info.wire.TextMarshalerT = gt
+		}
+		rt = ut.user
+	} else {
+		t := info.id.gobType()
+		switch typ := rt; typ.Kind() {
+		case reflect.Array:
+			info.wire.ArrayT = t.(*arrayType)
+		case reflect.Map:
+			info.wire.MapT = t.(*mapType)
+		case reflect.Slice:
+			// []byte == []uint8 is a special case handled separately
+			if typ.Elem().Kind() != reflect.Uint8 {
+				info.wire.SliceT = t.(*sliceType)
+			}
+		case reflect.Struct:
+			info.wire.StructT = t.(*structType)
+		}
+	}
+
+	if m := typeInfoMapInit; m != nil {
+		m[rt] = info
+		return info, nil
+	}
+
+	// Create new map with old contents plus new entry.
+	m, _ := typeInfoMap.Load().(map[reflect.Type]*typeInfo)
+	newm := make(map[reflect.Type]*typeInfo, len(m))
+	for k, v := range m {
+		newm[k] = v
+	}
+	newm[rt] = info
+	typeInfoMap.Store(newm)
+	return info, nil
+}
+
+// Called only when a panic is acceptable and unexpected.
+func mustGetTypeInfo(rt reflect.Type) *typeInfo {
+	t, err := getTypeInfo(userType(rt))
+	if err != nil {
+		panic("getTypeInfo: " + err.Error())
+	}
+	return t
+}
+
+// GobEncoder is the interface describing data that provides its own
+// representation for encoding values for transmission to a GobDecoder.
+// A type that implements GobEncoder and GobDecoder has complete
+// control over the representation of its data and may therefore
+// contain things such as private fields, channels, and functions,
+// which are not usually transmissible in gob streams.
+//
+// Note: Since gobs can be stored permanently, it is good design
+// to guarantee the encoding used by a GobEncoder is stable as the
+// software evolves. For instance, it might make sense for GobEncode
+// to include a version number in the encoding.
+type GobEncoder interface {
+	// GobEncode returns a byte slice representing the encoding of the
+	// receiver for transmission to a GobDecoder, usually of the same
+	// concrete type.
+	GobEncode() ([]byte, error)
+}
+
+// GobDecoder is the interface describing data that provides its own
+// routine for decoding transmitted values sent by a GobEncoder.
+type GobDecoder interface {
+	// GobDecode overwrites the receiver, which must be a pointer,
+	// with the value represented by the byte slice, which was written
+	// by GobEncode, usually for the same concrete type.
+	GobDecode([]byte) error
+}
+
+var (
+	nameToConcreteType sync.Map // map[string]reflect.Type
+	concreteTypeToName sync.Map // map[reflect.Type]string
+)
+
+// RegisterName is like [Register] but uses the provided name rather than the
+// type's default.
+func RegisterName(name string, value any) {
+	if name == "" {
+		// reserved for nil
+		panic("attempt to register empty name")
+	}
+
+	ut := userType(reflect.TypeOf(value))
+
+	// Check for incompatible duplicates. The name must refer to the
+	// same user type, and vice versa.
+
+	// Store the name and type provided by the user....
+	if t, dup := nameToConcreteType.LoadOrStore(name, reflect.TypeOf(value)); dup && t != ut.user {
+		panic(fmt.Sprintf("gob: registering duplicate types for %q: %s != %s", name, t, ut.user))
+	}
+
+	// but the flattened type in the type table, since that's what decode needs.
+	if n, dup := concreteTypeToName.LoadOrStore(ut.base, name); dup && n != name {
+		nameToConcreteType.Delete(name)
+		panic(fmt.Sprintf("gob: registering duplicate names for %s: %q != %q", ut.user, n, name))
+	}
+}
+
+// Register records a type, identified by a value for that type, under its
+// internal type name. That name will identify the concrete type of a value
+// sent or received as an interface variable. Only types that will be
+// transferred as implementations of interface values need to be registered.
+// Expecting to be used only during initialization, it panics if the mapping
+// between types and names is not a bijection.
+func Register(value any) {
+	// Default to printed representation for unnamed types
+	rt := reflect.TypeOf(value)
+	name := rt.String()
+
+	// But for named types (or pointers to them), qualify with import path (but see inner comment).
+	// Dereference one pointer looking for a named type.
+	star := ""
+	if rt.Name() == "" {
+		if pt := rt; pt.Kind() == reflect.Pointer {
+			star = "*"
+			// NOTE: The following line should be rt = pt.Elem() to implement
+			// what the comment above claims, but fixing it would break compatibility
+			// with existing gobs.
+			//
+			// Given package p imported as "full/p" with these definitions:
+			//     package p
+			//     type T1 struct { ... }
+			// this table shows the intended and actual strings used by gob to
+			// name the types:
+			//
+			// Type      Correct string     Actual string
+			//
+			// T1        full/p.T1          full/p.T1
+			// *T1       *full/p.T1         *p.T1
+			//
+			// The missing full path cannot be fixed without breaking existing gob decoders.
+			rt = pt
+		}
+	}
+	if rt.Name() != "" {
+		if rt.PkgPath() == "" {
+			name = star + rt.Name()
+		} else {
+			name = star + rt.PkgPath() + "." + rt.Name()
+		}
+	}
+
+	RegisterName(name, value)
+}
+
+func registerBasics() {
+	Register(int(0))
+	Register(int8(0))
+	Register(int16(0))
+	Register(int32(0))
+	Register(int64(0))
+	Register(uint(0))
+	Register(uint8(0))
+	Register(uint16(0))
+	Register(uint32(0))
+	Register(uint64(0))
+	Register(float32(0))
+	Register(float64(0))
+	Register(complex64(0i))
+	Register(complex128(0i))
+	Register(uintptr(0))
+	Register(false)
+	Register("")
+	Register([]byte(nil))
+	Register([]int(nil))
+	Register([]int8(nil))
+	Register([]int16(nil))
+	Register([]int32(nil))
+	Register([]int64(nil))
+	Register([]uint(nil))
+	Register([]uint8(nil))
+	Register([]uint16(nil))
+	Register([]uint32(nil))
+	Register([]uint64(nil))
+	Register([]float32(nil))
+	Register([]float64(nil))
+	Register([]complex64(nil))
+	Register([]complex128(nil))
+	Register([]uintptr(nil))
+	Register([]bool(nil))
+	Register([]string(nil))
+}
+
+func init() {
+	typeInfoMap.Store(typeInfoMapInit)
+	typeInfoMapInit = nil
+}
diff --git a/contrib/go/_std_1.22/src/encoding/gob/ya.make b/contrib/go/_std_1.22/src/encoding/gob/ya.make
new file mode 100644
index 0000000000..a791bed5af
--- /dev/null
+++ b/contrib/go/_std_1.22/src/encoding/gob/ya.make
@@ -0,0 +1,17 @@
+SUBSCRIBER(g:contrib)
+
+GO_LIBRARY()
+IF (TRUE)
+    SRCS(
+        dec_helpers.go
+        decode.go
+        decoder.go
+        doc.go
+        enc_helpers.go
+        encode.go
+        encoder.go
+        error.go
+        type.go
+    )
+ENDIF()
+END()