A data-only pickle serialization protocol implementation would need to skip calls to self.save_global() in pickle._Pickler.save() if condition(pickle_protocol)

A data-only pickle serialization protocol implementation would need to skip calls to self.save_global() in pickle._Pickler.save() if condition(pickle_protocol) here https://github.com/python/cpython/blob/main/Lib/pickle.py#L568 https://github.com/python/cpython/blob/main/Lib/pickle.py#L5... and #L585 , and also in the save_type() dispatch table at #L1123 .