[issue1580] Use shorter float repr when possible

[Guido van Rossum]

Guido van Rossum added the comment:

I'd be willing to require eval(repr(x)) == x only for platforms whose
float input routine is correctly rounding.  That would make the current
patch acceptable I believe -- but I believe you think there's a better
way in that case too?  What way is that?

Also, I'd rather not lock out non-IEEE-754 platforms, but I'm OK with
dropping the above roundtripping invariant there.

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