[issue18305] [patch] Fast sum() for non-numbers

[Ethan Furman]

Ethan Furman added the comment:

So making this a speed-up for generic objects using __iadd__ is out.

The only question remaining is: is it worth special casing a few specific objects (list, tuple, str) to optimise performance?

The str question has already been answered:  it's special cased to raise an error.

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