Guido van Rossum <gu...@python.org> added the comment: Maybe we should not fix this then? Copying seems unattractive, and the reason we proxy in the first place is not absolute safety but to make sure people don’t accidentally update the dict when they intend to update the class (for the side effect of updating slots when e.g. __add__ is added/removed.-- --Guido (mobile)
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