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

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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nosy: +rhettinger
versions:  -Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34396>
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