[issue1580] Use shorter float repr when possible

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

So is it worth trying to come up with a patch for this?  (Where this = 
making David Gay's code for strtod and dtoa usable from Python.)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1580>
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