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The documentation (at least the obvious places, see Doc/reference/datamodel.rst) says classes and class instances have the '__dict__' attribute, but nothing is said about what happens when assigning to it (like obj.__dict__ = something).
As far as I understand that's undefined behavior and other implementations may not work the same as CPython (and CPython itself behaves differently between versions).
I'd submit a documentation patch if I knew how to specify this matter. Maybe just say the behavior is not defined?