[issue38613] Optimize some set operations in dictkeys object

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

> How does it work with dict subclasses?

PySet_New(iterable) uses fast path only when `PyDict_CheckExact(iterable)` is true.

So there is no change for dict subclasses.

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