[issue22995] Restrict default pickleability

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

BTW Serhiy, can you please file a bug with upstream Cython?  I think you're the right person to do it since you added this restriction.  With reverting this in 2.7 and 3.5 it's not urgent, but we don't want to have to reopen this when 3.6 is out.

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<http://bugs.python.org/issue22995>
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