[issue4561] Optimize new io library

[Antoine Pitrou]

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

[...]

Although I agree all this is important, I'd challenge the assumption it
has its place in the buffered IO library rather than in lower-level
layers (i.e. kernel & userspace unbuffered IO).

In any case, it will be difficult to undo the current design decisions
(however misguided they may or may not be) of the py3k IO library and
we'll have to make the best out of them!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4561>
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