Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
> Maybe a new comparator is called for (like PY_EQ_FOR_HASH_COLLECTION), which
> would yield float("nan") equivalent to float("nan") and which should be used
> in hash-set/dict?
It is difficult to do from technical point of view because all rich comparison
implementations support currently only 6 operations. If you call tp_richcomp
with something else it will crash. So we need to add new slot tp_richcomp_ex
and complex logic to call either tp_richcomp_ex or tp_richcomp and correctly
handle inheritance. It is too high bar.
> Does GH-26679 need to be backported to the 3.10 branch?
I thought that the original change was 3.11 only, but seems it was merged
before the split of the 3.10 branch. So PR 26679 needs to be backported. I
would add a NEWS entry if I knew this.
----------
versions: +Python 3.10
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<https://bugs.python.org/issue43475>
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