[issue4565] Rewrite the IO stack in C

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> +1 to setting it up so that unit tests are always run against both and 
> keeping both.

If this is the way forward I recommend putting the pure Python versions
into a separate module, eg pyio.py (although the name is not very
elegant). It will make the separation clean and obvious.

(and perhaps it will have the side-effect of improving startup time,
although I'm not really worried about this)

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