[issue31179] Speed-up dict.copy() up to 5.5 times.

[STINNER Victor]

STINNER Victor added the comment:

> PyDict_Copy creates a new empty dict object and then inserts key/values into it one by one.

Why not creating a "preallocated" dict in that case? _PyDict_NewPresized()

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31179>
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