Mark Dickinson <dicki...@gmail.com> added the comment:

> (in this case a division by 10.0)

Of course, that's not true:  division by 10.0 is harmless when the
result is exactly representable.  It's actually a multiplication by
pow(10.0, -1), which is worse...

I'm currently working on incorporating David Gay's code for string <->
float conversions into Python.  If these go in, then it would be
straightforward to implement a fast, correctly-rounded round for floats
based on a combination of Gay's strtod and dtoa functions.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5473>
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