STINNER Victor <victor.stin...@gmail.com> added the comment:

I suggest to post-pone this optimization to Python 3.8. Faster list.sort() is 
nice to have, but I'm not sure that it's a killer feature that will make 
everybody move to Python 3.7. It can wait for 3.8.

No core dev took the lead on this non-trivial issue, and IMHO it's getting too 
late for 3.7.

It see that Serhiy started to review the change and asked for more benchmarks. 
Serhiy would be a good candidate to drive such work, but sadly he seems to be 
busy these days...

While such optimization is nice to have, we should be careful to not introduce 
a performance regressions on some cases. I read quickly the issue, and I'm not 
sure that it was fully carefully reviewed and tested yet. Sorry, I only read it 
quickly, ignore me if I'm wrong.

Well, if someone wants to take the responsability of pushing this right now, 
it's up to you :-)

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<https://bugs.python.org/issue28685>
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