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I’m facing a runtime issue with `1.0.0-RC2` (did not happen with `1.0.-RC`) with my custom serializer using Json.
It’s minified by the stacktrace contains this piece:

```Caused by: kotlinx.serialization.SerializationException: Serializer for class 'k' is not found.
Mark the class as @Serializable or provide the serializer explicitly.```

This sounds very similar to what I ran into with <https://github.com/Kotlin/kotlinx.serialization/issues/1094>, are you using the serializers for `JsonElement` directly?

There’s a PR here that will update the README’s ProGuard configuration: <https://github.com/Kotlin/kotlinx.serialization/pull/1095>