Sergey Shanshin

Merge after migrating kotlinx.serialization to the kotlin version `1.7.20`

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Hi, sorry for the delayed answer. @InsanusMokrassar , could you rollback the changes to the state when the build fell with `NoSuchElementException` and insert such code into any file in...

Fixed in `1.8.0`

> Is it going to 1.7.0 or 1.7.20? `1.7.20`

Merge after migrating kotlinx.serialization to the kotlin version `1.7.20`

Unfortunately, `JsonTransformingSerializer` does not currently support nullable types (you can't write something like `JsonTransformingSerializer(Program.serializer().nullable`).

@osipxd, thanks for the offer, but this improvement requires changing not only the serialization runtime, but also the plugin. The feature will be available after several Kotlin releases.

Target Kotlin release `1.8.0`

Merge after migrating kotlinx.serialization to the kotlin version `1.7.20`