Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

After discussing on Python-Dev all error messages were changed to "cannot 
pickle 'XXX' object".

https://mail.python.org/pipermail/python-dev/2018-October/155599.html

I suggest to not add __getstate__() methods with different error messages. But 
the dup() method should be fixed.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33023>
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