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## Changes in window functions
Added support of `RANGE` mode in window [frame](../syntax/window.md) definitions.
## Changes in built-in functions
Added the `AsOptionalType` function for idempotent wrapping of a type in Optional.
Added the `AsOptional` function for idempotent wrapping of a value in Optional.
Added the `PositionOf` function to get node positions.
Added the `WithIssue` function to add a custom frame with diagnostics to the validation stack.
## Changes in the Yson module {#yson-module}
The `Yson::IsUtf8`, `Yson::AsUtf8`, and `Yson::TryUtf8` functions have been added for working with nodes that are guaranteed to be valid Utf8 strings.
These nodes are also used to optimize the `Yson::ConvertTo` function when the `Utf8` type is used.
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