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kotlinlang

I get this error with 0.20.0-1.4-M3 serialization library;

`Polymorphic serializer for class ResponseMessage h…ame annotation or fall back to array polymorphism", cause: null, name: "va", stack: "va: Polymorphic serializer for class ResponseMessa…ame annotation or fall back to array polymorphism`

But I don't use any property with the name 'type'. When I change the classDiscriminator to something else it works.

Looks like the library is fighting with itself? Does anyone have any idea what causes this?