[issue38308] Add optional weighting to statistics.harmonic_mean()

[Zackery Spytz]

Zackery Spytz <zspytz at gmail.com> added the comment:

The "versionchanged" for *weights* should be 3.10, not 3.8.  I've created PR 23919 to fix this.

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versions: +Python 3.10 -Python 3.9

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<https://bugs.python.org/issue38308>
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