Polymorphic Entity Serializer
constructor(baseSchemaName: String, baseSchemaVersion: Int = -1, discriminator: String = DEFAULT_DISCRIMINATOR, unknownKeysStrategy: UnknownKeysStrategy = DEFAULT_UNKNOWN_KEY_STRATEGY, readSafety: <Error class: unknown class> = DynoReadSafety.SYNCHRONIZED)
constructor(baseKeySerializer: KSerializer<*>)