[issue21644] Optimize bytearray(int) constructor to use calloc()

[Bruce Merry]

Bruce Merry <bmerry at gmail.com> added the comment:

> I abandonned the issue because I didn't have time to work on it. If you want, you can open a new issue for that.

If I make a pull request and run some microbenchmarks, will you (or some other core dev) have time to review it? I've had a bad experience before with a PR that I'm still unable to get reviewed after several years, so I'd like to get at least a tentative agreement before I invest time in it.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue21644>
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