Antoine Pitrou <pit...@free.fr> added the comment:

> I don't agree that that was a worthy design goal.

I don't necessarily agree either, but it's probably too late now.
The py3k buffered IO object has additional methods (e.g. peek(),
read1()) which can be used by upper layers (text IO) and so can't be
replaced with the old 2.x file object.

In any case, Amaury has started rewriting the IO lib in C (*) and
getting good binary IO performance shouldn't be too difficult.

(*) http://svn.python.org/view/sandbox/trunk/io-c/

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<http://bugs.python.org/issue4561>
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