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

[Saul Shanabrook]

Saul Shanabrook added the comment:

I have added a failing test to based on the first example, of a class that provides the necessary methods, but fails to be an instance of Sequence.

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keywords: +patch
nosy: +saulshanabrook
Added file: http://bugs.python.org/file38935/patch.diff

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