src/dubbo/client.py [86:95]:
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        self,
        method_name: str,
        request_serializer: Optional[SerializingFunction] = None,
        response_deserializer: Optional[DeserializingFunction] = None,
    ) -> RpcCallable:
        return self._callable(
            MethodDescriptor(
                method_name=method_name,
                arg_serialization=(request_serializer, None),
                return_serialization=(None, response_deserializer),
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src/dubbo/client.py [131:141]:
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        self,
        method_name: str,
        request_serializer: Optional[SerializingFunction] = None,
        response_deserializer: Optional[DeserializingFunction] = None,
    ) -> RpcCallable:
        # create method descriptor
        return self._callable(
            MethodDescriptor(
                method_name=method_name,
                arg_serialization=(request_serializer, None),
                return_serialization=(None, response_deserializer),
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