[issue23493] optimize sort_keys in json module by using operator.itemgetter()

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> I am wondering why the change was not backported to 3.6 and 3.7?

These branches no longer accept optimizations or bugfixes, only security fixes:
https://devguide.python.org/#status-of-python-branches

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<https://bugs.python.org/issue23493>
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