[issue22995] Restrict default pickleability

[Stefan Behnel]

Stefan Behnel added the comment:

For reference, the bug in Cython is fixed here:

https://github.com/cython/cython/commit/ececb3e9473f6aaa65f29467921594c316ec2f06

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22995>
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