code: def _create_serializer(self) -> JsonObjectSerializer:
          
          if self._serializer_cache is None:
              serializer_cls = type(
                  "%sInternalSerializer" % type(self),
                  (JsonObjectSerializer,),
                  {
                      "_JSON_ENCODER_ARGS": self._args,
                      "_JSON_ENCODER_KWARGS": self._kwargs
                  }
              )
              self._serializer_cache = serializer_cls(self._get_property_mappings())
          return self._serializer_cache
docs: Create serializer that is to be used by this encoder
          :return: the serializer