[issue20726] inspect: Make Signature instances picklable

[Roundup Robot]

Roundup Robot added the comment:

New changeset f2bae047f6d0 by Yury Selivanov in branch 'default':
inspect.docs: Document that Signature and Parameter are now picklable (issue #20726)
http://hg.python.org/cpython/rev/f2bae047f6d0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20726>
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