Reference: list.sort(keylist: list | None = None, ...)

[dg-pb]

For future reference.

3. https://discuss.python.org/t/allow-sorted-to-take-list-for-key-argument/105106
4. Add keylist argument to list.sort python/cpython#142105
5. gh-142105: Add keylist argument to list.sort python/cpython#142106

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