[issue37555] _CallList.__contains__ doesn't always respect ANY.

[Elizabeth Uselton]

Elizabeth Uselton <elizabeth.uselton at gmail.com> added the comment:

Hi there, I completely missed that this had caused so much interesting discussion. I've added a regression test that shows the bug I was encountering, which seems to be related to 
 spec_set bypassing _Call's overwritten __eq__ and so not respecting ANY https://github.com/python/cpython/pull/14700

I agree, this is definitely also a third party bug with Django, but I think it's a problem here too, and am working on a fix.

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components: +Tests -Library (Lib)
nosy:  -serhiy.storchaka, xtreak
versions: +Python 3.5, Python 3.6

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