[issue38613] Optimize some set operations in dictkeys object

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

But what if a dict subclass overrides __iter__? You can get different result if set(d) != set(d.keys()).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38613>
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