[issue20334] make inspect Signature hashable

[Roundup Robot]

Roundup Robot added the comment:

New changeset 932d69ef0c63 by Yury Selivanov in branch 'default':
inspect: Make Signature and Parameter hashable. Issue #20334.
http://hg.python.org/cpython/rev/932d69ef0c63

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20334>
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