[issue20688] 3.4 cherry-pick: 65fb95578f94 inspect: Fix getfullargspec() to not to follow __wrapped__ chains

[Yury Selivanov]

Yury Selivanov added the comment:

> ok.
Great, thanks Larry!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20688>
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