Merge pull request #43056 from ydb-platform/merge-rightlib-260610-0127HEADmain

1 files changed, 0 insertions, 581 deletions

diff --git a/contrib/go/_std_1.25/src/encoding/json/v2/arshal.go b/contrib/go/_std_1.25/src/encoding/json/v2/arshal.go
deleted file mode 100644
index 5cd2106be93..00000000000
--- a/contrib/go/_std_1.25/src/encoding/json/v2/arshal.go
+++ /dev/null
@@ -1,581 +0,0 @@
-// Copyright 2020 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 goexperiment.jsonv2
-
-package json
-
-import (
-	"bytes"
-	"encoding"
-	"io"
-	"reflect"
-	"slices"
-	"strings"
-	"sync"
-	"time"
-
-	"encoding/json/internal"
-	"encoding/json/internal/jsonflags"
-	"encoding/json/internal/jsonopts"
-	"encoding/json/jsontext"
-)
-
-// Reference encoding and time packages to assist pkgsite
-// in being able to hotlink references to those packages.
-var (
-	_ encoding.TextMarshaler
-	_ encoding.TextAppender
-	_ encoding.TextUnmarshaler
-	_ time.Time
-	_ time.Duration
-)
-
-// export exposes internal functionality of the "jsontext" package.
-var export = jsontext.Internal.Export(&internal.AllowInternalUse)
-
-// Marshal serializes a Go value as a []byte according to the provided
-// marshal and encode options (while ignoring unmarshal or decode options).
-// It does not terminate the output with a newline.
-//
-// Type-specific marshal functions and methods take precedence
-// over the default representation of a value.
-// Functions or methods that operate on *T are only called when encoding
-// a value of type T (by taking its address) or a non-nil value of *T.
-// Marshal ensures that a value is always addressable
-// (by boxing it on the heap if necessary) so that
-// these functions and methods can be consistently called. For performance,
-// it is recommended that Marshal be passed a non-nil pointer to the value.
-//
-// The input value is encoded as JSON according the following rules:
-//
-//   - If any type-specific functions in a [WithMarshalers] option match
-//     the value type, then those functions are called to encode the value.
-//     If all applicable functions return [SkipFunc],
-//     then the value is encoded according to subsequent rules.
-//
-//   - If the value type implements [MarshalerTo],
-//     then the MarshalJSONTo method is called to encode the value.
-//
-//   - If the value type implements [Marshaler],
-//     then the MarshalJSON method is called to encode the value.
-//
-//   - If the value type implements [encoding.TextAppender],
-//     then the AppendText method is called to encode the value and
-//     subsequently encode its result as a JSON string.
-//
-//   - If the value type implements [encoding.TextMarshaler],
-//     then the MarshalText method is called to encode the value and
-//     subsequently encode its result as a JSON string.
-//
-//   - Otherwise, the value is encoded according to the value's type
-//     as described in detail below.
-//
-// Most Go types have a default JSON representation.
-// Certain types support specialized formatting according to
-// a format flag optionally specified in the Go struct tag
-// for the struct field that contains the current value
-// (see the “JSON Representation of Go structs” section for more details).
-//
-// The representation of each type is as follows:
-//
-//   - A Go boolean is encoded as a JSON boolean (e.g., true or false).
-//     It does not support any custom format flags.
-//
-//   - A Go string is encoded as a JSON string.
-//     It does not support any custom format flags.
-//
-//   - A Go []byte or [N]byte is encoded as a JSON string containing
-//     the binary value encoded using RFC 4648.
-//     If the format is "base64" or unspecified, then this uses RFC 4648, section 4.
-//     If the format is "base64url", then this uses RFC 4648, section 5.
-//     If the format is "base32", then this uses RFC 4648, section 6.
-//     If the format is "base32hex", then this uses RFC 4648, section 7.
-//     If the format is "base16" or "hex", then this uses RFC 4648, section 8.
-//     If the format is "array", then the bytes value is encoded as a JSON array
-//     where each byte is recursively JSON-encoded as each JSON array element.
-//
-//   - A Go integer is encoded as a JSON number without fractions or exponents.
-//     If [StringifyNumbers] is specified or encoding a JSON object name,
-//     then the JSON number is encoded within a JSON string.
-//     It does not support any custom format flags.
-//
-//   - A Go float is encoded as a JSON number.
-//     If [StringifyNumbers] is specified or encoding a JSON object name,
-//     then the JSON number is encoded within a JSON string.
-//     If the format is "nonfinite", then NaN, +Inf, and -Inf are encoded as
-//     the JSON strings "NaN", "Infinity", and "-Infinity", respectively.
-//     Otherwise, the presence of non-finite numbers results in a [SemanticError].
-//
-//   - A Go map is encoded as a JSON object, where each Go map key and value
-//     is recursively encoded as a name and value pair in the JSON object.
-//     The Go map key must encode as a JSON string, otherwise this results
-//     in a [SemanticError]. The Go map is traversed in a non-deterministic order.
-//     For deterministic encoding, consider using the [Deterministic] option.
-//     If the format is "emitnull", then a nil map is encoded as a JSON null.
-//     If the format is "emitempty", then a nil map is encoded as an empty JSON object,
-//     regardless of whether [FormatNilMapAsNull] is specified.
-//     Otherwise by default, a nil map is encoded as an empty JSON object.
-//
-//   - A Go struct is encoded as a JSON object.
-//     See the “JSON Representation of Go structs” section
-//     in the package-level documentation for more details.
-//
-//   - A Go slice is encoded as a JSON array, where each Go slice element
-//     is recursively JSON-encoded as the elements of the JSON array.
-//     If the format is "emitnull", then a nil slice is encoded as a JSON null.
-//     If the format is "emitempty", then a nil slice is encoded as an empty JSON array,
-//     regardless of whether [FormatNilSliceAsNull] is specified.
-//     Otherwise by default, a nil slice is encoded as an empty JSON array.
-//
-//   - A Go array is encoded as a JSON array, where each Go array element
-//     is recursively JSON-encoded as the elements of the JSON array.
-//     The JSON array length is always identical to the Go array length.
-//     It does not support any custom format flags.
-//
-//   - A Go pointer is encoded as a JSON null if nil, otherwise it is
-//     the recursively JSON-encoded representation of the underlying value.
-//     Format flags are forwarded to the encoding of the underlying value.
-//
-//   - A Go interface is encoded as a JSON null if nil, otherwise it is
-//     the recursively JSON-encoded representation of the underlying value.
-//     It does not support any custom format flags.
-//
-//   - A Go [time.Time] is encoded as a JSON string containing the timestamp
-//     formatted in RFC 3339 with nanosecond precision.
-//     If the format matches one of the format constants declared
-//     in the time package (e.g., RFC1123), then that format is used.
-//     If the format is "unix", "unixmilli", "unixmicro", or "unixnano",
-//     then the timestamp is encoded as a possibly fractional JSON number
-//     of the number of seconds (or milliseconds, microseconds, or nanoseconds)
-//     since the Unix epoch, which is January 1st, 1970 at 00:00:00 UTC.
-//     To avoid a fractional component, round the timestamp to the relevant unit.
-//     Otherwise, the format is used as-is with [time.Time.Format] if non-empty.
-//
-//   - A Go [time.Duration] currently has no default representation and
-//     requires an explicit format to be specified.
-//     If the format is "sec", "milli", "micro", or "nano",
-//     then the duration is encoded as a possibly fractional JSON number
-//     of the number of seconds (or milliseconds, microseconds, or nanoseconds).
-//     To avoid a fractional component, round the duration to the relevant unit.
-//     If the format is "units", it is encoded as a JSON string formatted using
-//     [time.Duration.String] (e.g., "1h30m" for 1 hour 30 minutes).
-//     If the format is "iso8601", it is encoded as a JSON string using the
-//     ISO 8601 standard for durations (e.g., "PT1H30M" for 1 hour 30 minutes)
-//     using only accurate units of hours, minutes, and seconds.
-//
-//   - All other Go types (e.g., complex numbers, channels, and functions)
-//     have no default representation and result in a [SemanticError].
-//
-// JSON cannot represent cyclic data structures and Marshal does not handle them.
-// Passing cyclic structures will result in an error.
-func Marshal(in any, opts ...Options) (out []byte, err error) {
-	enc := export.GetBufferedEncoder(opts...)
-	defer export.PutBufferedEncoder(enc)
-	xe := export.Encoder(enc)
-	xe.Flags.Set(jsonflags.OmitTopLevelNewline | 1)
-	err = marshalEncode(enc, in, &xe.Struct)
-	if err != nil && xe.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
-		return nil, internal.TransformMarshalError(in, err)
-	}
-	return bytes.Clone(xe.Buf), err
-}
-
-// MarshalWrite serializes a Go value into an [io.Writer] according to the provided
-// marshal and encode options (while ignoring unmarshal or decode options).
-// It does not terminate the output with a newline.
-// See [Marshal] for details about the conversion of a Go value into JSON.
-func MarshalWrite(out io.Writer, in any, opts ...Options) (err error) {
-	enc := export.GetStreamingEncoder(out, opts...)
-	defer export.PutStreamingEncoder(enc)
-	xe := export.Encoder(enc)
-	xe.Flags.Set(jsonflags.OmitTopLevelNewline | 1)
-	err = marshalEncode(enc, in, &xe.Struct)
-	if err != nil && xe.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
-		return internal.TransformMarshalError(in, err)
-	}
-	return err
-}
-
-// MarshalEncode serializes a Go value into an [jsontext.Encoder] according to
-// the provided marshal options (while ignoring unmarshal, encode, or decode options).
-// Any marshal-relevant options already specified on the [jsontext.Encoder]
-// take lower precedence than the set of options provided by the caller.
-// Unlike [Marshal] and [MarshalWrite], encode options are ignored because
-// they must have already been specified on the provided [jsontext.Encoder].
-//
-// See [Marshal] for details about the conversion of a Go value into JSON.
-func MarshalEncode(out *jsontext.Encoder, in any, opts ...Options) (err error) {
-	xe := export.Encoder(out)
-	if len(opts) > 0 {
-		optsOriginal := xe.Struct
-		defer func() { xe.Struct = optsOriginal }()
-		xe.Struct.JoinWithoutCoderOptions(opts...)
-	}
-	err = marshalEncode(out, in, &xe.Struct)
-	if err != nil && xe.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
-		return internal.TransformMarshalError(in, err)
-	}
-	return err
-}
-
-func marshalEncode(out *jsontext.Encoder, in any, mo *jsonopts.Struct) (err error) {
-	v := reflect.ValueOf(in)
-	if !v.IsValid() || (v.Kind() == reflect.Pointer && v.IsNil()) {
-		return out.WriteToken(jsontext.Null)
-	}
-	// Shallow copy non-pointer values to obtain an addressable value.
-	// It is beneficial to performance to always pass pointers to avoid this.
-	forceAddr := v.Kind() != reflect.Pointer
-	if forceAddr {
-		v2 := reflect.New(v.Type())
-		v2.Elem().Set(v)
-		v = v2
-	}
-	va := addressableValue{v.Elem(), forceAddr} // dereferenced pointer is always addressable
-	t := va.Type()
-
-	// Lookup and call the marshal function for this type.
-	marshal := lookupArshaler(t).marshal
-	if mo.Marshalers != nil {
-		marshal, _ = mo.Marshalers.(*Marshalers).lookup(marshal, t)
-	}
-	if err := marshal(out, va, mo); err != nil {
-		if !mo.Flags.Get(jsonflags.AllowDuplicateNames) {
-			export.Encoder(out).Tokens.InvalidateDisabledNamespaces()
-		}
-		return err
-	}
-	return nil
-}
-
-// Unmarshal decodes a []byte input into a Go value according to the provided
-// unmarshal and decode options (while ignoring marshal or encode options).
-// The input must be a single JSON value with optional whitespace interspersed.
-// The output must be a non-nil pointer.
-//
-// Type-specific unmarshal functions and methods take precedence
-// over the default representation of a value.
-// Functions or methods that operate on *T are only called when decoding
-// a value of type T (by taking its address) or a non-nil value of *T.
-// Unmarshal ensures that a value is always addressable
-// (by boxing it on the heap if necessary) so that
-// these functions and methods can be consistently called.
-//
-// The input is decoded into the output according the following rules:
-//
-//   - If any type-specific functions in a [WithUnmarshalers] option match
-//     the value type, then those functions are called to decode the JSON
-//     value. If all applicable functions return [SkipFunc],
-//     then the input is decoded according to subsequent rules.
-//
-//   - If the value type implements [UnmarshalerFrom],
-//     then the UnmarshalJSONFrom method is called to decode the JSON value.
-//
-//   - If the value type implements [Unmarshaler],
-//     then the UnmarshalJSON method is called to decode the JSON value.
-//
-//   - If the value type implements [encoding.TextUnmarshaler],
-//     then the input is decoded as a JSON string and
-//     the UnmarshalText method is called with the decoded string value.
-//     This fails with a [SemanticError] if the input is not a JSON string.
-//
-//   - Otherwise, the JSON value is decoded according to the value's type
-//     as described in detail below.
-//
-// Most Go types have a default JSON representation.
-// Certain types support specialized formatting according to
-// a format flag optionally specified in the Go struct tag
-// for the struct field that contains the current value
-// (see the “JSON Representation of Go structs” section for more details).
-// A JSON null may be decoded into every supported Go value where
-// it is equivalent to storing the zero value of the Go value.
-// If the input JSON kind is not handled by the current Go value type,
-// then this fails with a [SemanticError]. Unless otherwise specified,
-// the decoded value replaces any pre-existing value.
-//
-// The representation of each type is as follows:
-//
-//   - A Go boolean is decoded from a JSON boolean (e.g., true or false).
-//     It does not support any custom format flags.
-//
-//   - A Go string is decoded from a JSON string.
-//     It does not support any custom format flags.
-//
-//   - A Go []byte or [N]byte is decoded from a JSON string
-//     containing the binary value encoded using RFC 4648.
-//     If the format is "base64" or unspecified, then this uses RFC 4648, section 4.
-//     If the format is "base64url", then this uses RFC 4648, section 5.
-//     If the format is "base32", then this uses RFC 4648, section 6.
-//     If the format is "base32hex", then this uses RFC 4648, section 7.
-//     If the format is "base16" or "hex", then this uses RFC 4648, section 8.
-//     If the format is "array", then the Go slice or array is decoded from a
-//     JSON array where each JSON element is recursively decoded for each byte.
-//     When decoding into a non-nil []byte, the slice length is reset to zero
-//     and the decoded input is appended to it.
-//     When decoding into a [N]byte, the input must decode to exactly N bytes,
-//     otherwise it fails with a [SemanticError].
-//
-//   - A Go integer is decoded from a JSON number.
-//     It must be decoded from a JSON string containing a JSON number
-//     if [StringifyNumbers] is specified or decoding a JSON object name.
-//     It fails with a [SemanticError] if the JSON number
-//     has a fractional or exponent component.
-//     It also fails if it overflows the representation of the Go integer type.
-//     It does not support any custom format flags.
-//
-//   - A Go float is decoded from a JSON number.
-//     It must be decoded from a JSON string containing a JSON number
-//     if [StringifyNumbers] is specified or decoding a JSON object name.
-//     It fails if it overflows the representation of the Go float type.
-//     If the format is "nonfinite", then the JSON strings
-//     "NaN", "Infinity", and "-Infinity" are decoded as NaN, +Inf, and -Inf.
-//     Otherwise, the presence of such strings results in a [SemanticError].
-//
-//   - A Go map is decoded from a JSON object,
-//     where each JSON object name and value pair is recursively decoded
-//     as the Go map key and value. Maps are not cleared.
-//     If the Go map is nil, then a new map is allocated to decode into.
-//     If the decoded key matches an existing Go map entry, the entry value
-//     is reused by decoding the JSON object value into it.
-//     The formats "emitnull" and "emitempty" have no effect when decoding.
-//
-//   - A Go struct is decoded from a JSON object.
-//     See the “JSON Representation of Go structs” section
-//     in the package-level documentation for more details.
-//
-//   - A Go slice is decoded from a JSON array, where each JSON element
-//     is recursively decoded and appended to the Go slice.
-//     Before appending into a Go slice, a new slice is allocated if it is nil,
-//     otherwise the slice length is reset to zero.
-//     The formats "emitnull" and "emitempty" have no effect when decoding.
-//
-//   - A Go array is decoded from a JSON array, where each JSON array element
-//     is recursively decoded as each corresponding Go array element.
-//     Each Go array element is zeroed before decoding into it.
-//     It fails with a [SemanticError] if the JSON array does not contain
-//     the exact same number of elements as the Go array.
-//     It does not support any custom format flags.
-//
-//   - A Go pointer is decoded based on the JSON kind and underlying Go type.
-//     If the input is a JSON null, then this stores a nil pointer.
-//     Otherwise, it allocates a new underlying value if the pointer is nil,
-//     and recursively JSON decodes into the underlying value.
-//     Format flags are forwarded to the decoding of the underlying type.
-//
-//   - A Go interface is decoded based on the JSON kind and underlying Go type.
-//     If the input is a JSON null, then this stores a nil interface value.
-//     Otherwise, a nil interface value of an empty interface type is initialized
-//     with a zero Go bool, string, float64, map[string]any, or []any if the
-//     input is a JSON boolean, string, number, object, or array, respectively.
-//     If the interface value is still nil, then this fails with a [SemanticError]
-//     since decoding could not determine an appropriate Go type to decode into.
-//     For example, unmarshaling into a nil io.Reader fails since
-//     there is no concrete type to populate the interface value with.
-//     Otherwise an underlying value exists and it recursively decodes
-//     the JSON input into it. It does not support any custom format flags.
-//
-//   - A Go [time.Time] is decoded from a JSON string containing the time
-//     formatted in RFC 3339 with nanosecond precision.
-//     If the format matches one of the format constants declared in
-//     the time package (e.g., RFC1123), then that format is used for parsing.
-//     If the format is "unix", "unixmilli", "unixmicro", or "unixnano",
-//     then the timestamp is decoded from an optionally fractional JSON number
-//     of the number of seconds (or milliseconds, microseconds, or nanoseconds)
-//     since the Unix epoch, which is January 1st, 1970 at 00:00:00 UTC.
-//     Otherwise, the format is used as-is with [time.Time.Parse] if non-empty.
-//
-//   - A Go [time.Duration] currently has no default representation and
-//     requires an explicit format to be specified.
-//     If the format is "sec", "milli", "micro", or "nano",
-//     then the duration is decoded from an optionally fractional JSON number
-//     of the number of seconds (or milliseconds, microseconds, or nanoseconds).
-//     If the format is "units", it is decoded from a JSON string parsed using
-//     [time.ParseDuration] (e.g., "1h30m" for 1 hour 30 minutes).
-//     If the format is "iso8601", it is decoded from a JSON string using the
-//     ISO 8601 standard for durations (e.g., "PT1H30M" for 1 hour 30 minutes)
-//     accepting only accurate units of hours, minutes, or seconds.
-//
-//   - All other Go types (e.g., complex numbers, channels, and functions)
-//     have no default representation and result in a [SemanticError].
-//
-// In general, unmarshaling follows merge semantics (similar to RFC 7396)
-// where the decoded Go value replaces the destination value
-// for any JSON kind other than an object.
-// For JSON objects, the input object is merged into the destination value
-// where matching object members recursively apply merge semantics.
-func Unmarshal(in []byte, out any, opts ...Options) (err error) {
-	dec := export.GetBufferedDecoder(in, opts...)
-	defer export.PutBufferedDecoder(dec)
-	xd := export.Decoder(dec)
-	err = unmarshalFull(dec, out, &xd.Struct)
-	if err != nil && xd.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
-		return internal.TransformUnmarshalError(out, err)
-	}
-	return err
-}
-
-// UnmarshalRead deserializes a Go value from an [io.Reader] according to the
-// provided unmarshal and decode options (while ignoring marshal or encode options).
-// The input must be a single JSON value with optional whitespace interspersed.
-// It consumes the entirety of [io.Reader] until [io.EOF] is encountered,
-// without reporting an error for EOF. The output must be a non-nil pointer.
-// See [Unmarshal] for details about the conversion of JSON into a Go value.
-func UnmarshalRead(in io.Reader, out any, opts ...Options) (err error) {
-	dec := export.GetStreamingDecoder(in, opts...)
-	defer export.PutStreamingDecoder(dec)
-	xd := export.Decoder(dec)
-	err = unmarshalFull(dec, out, &xd.Struct)
-	if err != nil && xd.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
-		return internal.TransformUnmarshalError(out, err)
-	}
-	return err
-}
-
-func unmarshalFull(in *jsontext.Decoder, out any, uo *jsonopts.Struct) error {
-	switch err := unmarshalDecode(in, out, uo); err {
-	case nil:
-		return export.Decoder(in).CheckEOF()
-	case io.EOF:
-		offset := in.InputOffset() + int64(len(in.UnreadBuffer()))
-		return &jsontext.SyntacticError{ByteOffset: offset, Err: io.ErrUnexpectedEOF}
-	default:
-		return err
-	}
-}
-
-// UnmarshalDecode deserializes a Go value from a [jsontext.Decoder] according to
-// the provided unmarshal options (while ignoring marshal, encode, or decode options).
-// Any unmarshal options already specified on the [jsontext.Decoder]
-// take lower precedence than the set of options provided by the caller.
-// Unlike [Unmarshal] and [UnmarshalRead], decode options are ignored because
-// they must have already been specified on the provided [jsontext.Decoder].
-//
-// The input may be a stream of one or more JSON values,
-// where this only unmarshals the next JSON value in the stream.
-// The output must be a non-nil pointer.
-// See [Unmarshal] for details about the conversion of JSON into a Go value.
-func UnmarshalDecode(in *jsontext.Decoder, out any, opts ...Options) (err error) {
-	xd := export.Decoder(in)
-	if len(opts) > 0 {
-		optsOriginal := xd.Struct
-		defer func() { xd.Struct = optsOriginal }()
-		xd.Struct.JoinWithoutCoderOptions(opts...)
-	}
-	err = unmarshalDecode(in, out, &xd.Struct)
-	if err != nil && xd.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
-		return internal.TransformUnmarshalError(out, err)
-	}
-	return err
-}
-
-func unmarshalDecode(in *jsontext.Decoder, out any, uo *jsonopts.Struct) (err error) {
-	v := reflect.ValueOf(out)
-	if v.Kind() != reflect.Pointer || v.IsNil() {
-		return &SemanticError{action: "unmarshal", GoType: reflect.TypeOf(out), Err: internal.ErrNonNilReference}
-	}
-	va := addressableValue{v.Elem(), false} // dereferenced pointer is always addressable
-	t := va.Type()
-
-	// In legacy semantics, the entirety of the next JSON value
-	// was validated before attempting to unmarshal it.
-	if uo.Flags.Get(jsonflags.ReportErrorsWithLegacySemantics) {
-		if err := export.Decoder(in).CheckNextValue(); err != nil {
-			return err
-		}
-	}
-
-	// Lookup and call the unmarshal function for this type.
-	unmarshal := lookupArshaler(t).unmarshal
-	if uo.Unmarshalers != nil {
-		unmarshal, _ = uo.Unmarshalers.(*Unmarshalers).lookup(unmarshal, t)
-	}
-	if err := unmarshal(in, va, uo); err != nil {
-		if !uo.Flags.Get(jsonflags.AllowDuplicateNames) {
-			export.Decoder(in).Tokens.InvalidateDisabledNamespaces()
-		}
-		return err
-	}
-	return nil
-}
-
-// addressableValue is a reflect.Value that is guaranteed to be addressable
-// such that calling the Addr and Set methods do not panic.
-//
-// There is no compile magic that enforces this property,
-// but rather the need to construct this type makes it easier to examine each
-// construction site to ensure that this property is upheld.
-type addressableValue struct {
-	reflect.Value
-
-	// forcedAddr reports whether this value is addressable
-	// only through the use of [newAddressableValue].
-	// This is only used for [jsonflags.CallMethodsWithLegacySemantics].
-	forcedAddr bool
-}
-
-// newAddressableValue constructs a new addressable value of type t.
-func newAddressableValue(t reflect.Type) addressableValue {
-	return addressableValue{reflect.New(t).Elem(), true}
-}
-
-// TODO: Remove *jsonopts.Struct argument from [marshaler] and [unmarshaler].
-// This can be directly accessed on the encoder or decoder.
-
-// All marshal and unmarshal behavior is implemented using these signatures.
-// The *jsonopts.Struct argument is guaranteed to identical to or at least
-// a strict super-set of the options in Encoder.Struct or Decoder.Struct.
-// It is identical for Marshal, Unmarshal, MarshalWrite, and UnmarshalRead.
-// It is a super-set for MarshalEncode and UnmarshalDecode.
-type (
-	marshaler   = func(*jsontext.Encoder, addressableValue, *jsonopts.Struct) error
-	unmarshaler = func(*jsontext.Decoder, addressableValue, *jsonopts.Struct) error
-)
-
-type arshaler struct {
-	marshal    marshaler
-	unmarshal  unmarshaler
-	nonDefault bool
-}
-
-var lookupArshalerCache sync.Map // map[reflect.Type]*arshaler
-
-func lookupArshaler(t reflect.Type) *arshaler {
-	if v, ok := lookupArshalerCache.Load(t); ok {
-		return v.(*arshaler)
-	}
-
-	fncs := makeDefaultArshaler(t)
-	fncs = makeMethodArshaler(fncs, t)
-	fncs = makeTimeArshaler(fncs, t)
-
-	// Use the last stored so that duplicate arshalers can be garbage collected.
-	v, _ := lookupArshalerCache.LoadOrStore(t, fncs)
-	return v.(*arshaler)
-}
-
-var stringsPools = &sync.Pool{New: func() any { return new(stringSlice) }}
-
-type stringSlice []string
-
-// getStrings returns a non-nil pointer to a slice with length n.
-func getStrings(n int) *stringSlice {
-	s := stringsPools.Get().(*stringSlice)
-	if cap(*s) < n {
-		*s = make([]string, n)
-	}
-	*s = (*s)[:n]
-	return s
-}
-
-func putStrings(s *stringSlice) {
-	if cap(*s) > 1<<10 {
-		*s = nil // avoid pinning arbitrarily large amounts of memory
-	}
-	stringsPools.Put(s)
-}
-
-func (ss *stringSlice) Sort() {
-	slices.SortFunc(*ss, func(x, y string) int { return strings.Compare(x, y) })
-}