[issue34396] Certain methods that heap allocated subtypes inherit suffer a 50-80% performance penalty

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Some thoughs:

* Lib/sets.py benefitted significantly from itertools and METH_COEXIST.

* The dunder methods are part of the public API.  Serhiy's persona tastes aside, there is no reason not to use them like any other method.

* Given a performance trade-off between classes and subclasses, almost universally we give preference to the parent class.

* The folks who use itertools with __getitem__ and __contains__ almost always do so because they care about speed and have a preference for a functional style.  Removing the current optimization would directly hit those folks and their style of coding, resulting in code that used to be fast and elegant becoming slow.

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<https://bugs.python.org/issue34396>
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