What is the current status of serialization+native+multiplatform? Is workaround for plugin path still required?

The error you’ve mentioned is thrown from

KClass.serializer()

method. It is indeed unavailable on Native due to the lack of reflection; as message says, we have a plan to intrinsify it. Right now you have to always explicitly pass a serializer, obtaining it from e.g. generated

.serializer()

function on Companion object of serializable class.

It works, thanks!