Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:

On Sun, Jan 05, 2020 at 02:19:49AM +0000, Tim Peters wrote:

> Since, best I can recall, nobody has asked about this before

See discussion here:

https://mail.python.org/archives/list/python-...@python.org/message/5AQMG6ADD6RGPLI3VTILB2MKXMBFTIGU/

which followed from discussions on sort order. I was asked to provide a 
PR, but I have technical difficulties with github.

I think it's sufficient to say that sorting relies only on the `<` 
operator, and link to the section of the docs that map special dunders 
to comparison operators, namely here:

https://docs.python.org/3/reference/datamodel.html#object.__lt__

where it goes into detail about reflected methods and such.

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<https://bugs.python.org/issue39210>
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