[issue1580] Use shorter float repr when possible

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

> If someone has a more recent version of MS's compiler, 
> I'd be interested to know what this does:

Visual Studio 2008 Express Edition gives the same results:
['1024', '1024', '1024', '1024', '1024', '1024', '1024.000000000001']
(Tested release and debug builds, with trunk version and py3k branch)

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nosy: +amaury.forgeotdarc

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