[issue17482] functools.update_wrapper mishandles __wrapped__

[Nick Coghlan]

Nick Coghlan added the comment:

Georg, just a heads up that I was informed of a fairly significant bug in the __wrapped__ handling which some folks doing function introspection had been assuming was a feature.

I'd like to fix it for 3.3.3, but need your +1 as RM since it *will* break introspection code which assumes the current behaviour was intentional.

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nosy: +georg.brandl

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