[issue22995] Restrict default pickleability

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Therefore my guess was true. There is a bug in Cython. It creates classes that can't be correctly unpickled or copied.

The question is wherever we should replace TypeError with a warning in maintained releases, or remove this check at all? Here is a patch against 3.5 that replaces TypeError with a warning.

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stage: resolved -> patch review
versions:  -Python 3.6
Added file: http://bugs.python.org/file41582/pickle_restrictions_warning-3.5.patch

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