[issue46906] Add PyFloat_(Pack|Unpack)(2|4|8) to the public C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

PR for msgpack: https://github.com/msgpack/msgpack-python/pull/499

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