[issue19973] Deprecate pyio

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

PyPy also has a "C-translated" version of the io module.
It's a bit faster I think, but more importantly it has correct behavior with signals and other asynchronous errors.

_pyio.py can be stopped in the middle of any function, and is not completely signal-safe.

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nosy: +amaury.forgeotdarc

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