code: private void initCommonAndGroupSchemaSerialization() {
      //TODO Should SerializationInfo contain Configuration ?
      commonSerializers = getSerializers(commonSchema, null);
      commonDeserializers = getDeserializers(commonSchema, commonSchema, null);
  
      groupSerializers = getSerializers(groupSchema, null);
      groupDeserializers = getDeserializers(groupSchema, groupSchema, null);
    }
docs: This serializers have been defined by the user in an OBJECT field