[issue23864] issubclass without registration only works for "one-trick pony" collections ABCs.

[Géry]

Géry <gery.ogam at gmail.com> added the comment:

Guido, could we add those missing __subclasshook__ for consistency?

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nosy: +gvanrossum, maggyero

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23864>
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