Message 257542 - Python tracker

Note that setting some special methods (such as __copy__, __deepcopy__, __reduce_ex__, __reduce__, __setstate__, etc) to None has different meaning. The value None is just ignored and corresponding operation is fall back to other methods. For example copy.deepcopy() uses __reduce_ex__ if __deepcopy__ is None, __reduce__ if __reduce_ex__ is None.

May be this should be changed.