Paul Ganssle <p.gans...@gmail.com> added the comment:

I would be somewhat worried that this might break something like numpy (though 
not numpy specifically) which might be counting on the ability to write a 
wrapper that overloads this behavior.

Another concern is that people could be playing it fast-and-loose with actual 
types, and are returning something that fits the bill for a 
collections.abc.Sequence with length 2 (e.g. return [a, b]) but isn't an actual 
Tuple.

I would at least think that this should go through a deprecation cycle.

----------
nosy: +p-ganssle

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34676>
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