[issue13479] pickle too picky on re-defined classes

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Hm, this change allows many other *undesirable* objects pass the test as well. I'd prefer to stick to the rule, "when in doubt, raise an error".
Maybe using == instead of 'is' as the test would be acceptable?

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nosy: +gvanrossum

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