Andrew Barnert added the comment:

See #25958, which incorporates a similar refactoring in service of making all 
of the subclasshooks in collections.abc handle None the same way.

We definitely do want something public in the abc module like this, rather than 
the private function in collections.abc that I wrote, especially given the 
discussion about moving a bunch of the ABCs to other modules.

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nosy: +abarnert

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<http://bugs.python.org/issue22268>
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