Hi all, I'm having trouble using a `JsonTransformi...

# serialization

[growse]

Hi all, I'm having trouble using a JsonTransformingSerializer with a subclass, in that specifying the serializer in the mapper module doesn't seem to work. If I have:

object JsonTransforming : JsonTransformingSerializer<MessageConfiguration>(
    MessageConfiguration.serializer()
) {...}

and set up a mapper as

Json { 
    classDiscriminator = "_type"
    serializersModule = SerializersModule {
        polymorphic(MessageBase::class, MessageConfiguration::class, JsonTransforming)
    }
}

Then calling decodeFromString only works properly if I pass in the serialization strategy explicitly.

decodeFromString<MessageBase>(JsonTransforming, input) // This works
decodeFromString<MessageBase>(input) // This doesn't run the transformer

My expectation is that specifying the polymorphic bit in the serializersModule would be sufficient for the deserializer to apply the transformer when it's deserializing a MessageConfiguration, but it seems not. What am I doing wrong?