[issue23460] Decimals do not obey ':g' exponential notation formatting rules

[Stefan Krah]

Stefan Krah <stefan at bytereef.org> added the comment:

The patch LGTM, but I'm not sure if we need to document __format__().
Personally I probably wouldn't.

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nosy: +xtreak

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<https://bugs.python.org/issue23460>
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