[issue46906] Make _PyFloat_(Pack|Unpack)(4|8) cpython API, not internal.

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

OK. By quick grepping, I found only msgpack and bitstruct use these API.
It is not enough number to make them public.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46906>
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