[issue1580] Use shorter float repr when possible

[Mark Dickinson]

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

Mildly off-topic:  it seems that currently eval(repr(x)) == x isn't 
always true, anyway.  On OS X 10.5.4/Intel, I get:

>>> x = (2**52-1)*2.**(-1074)
>>> x
2.2250738585072009e-308
>>> y = eval(repr(x))
>>> y
2.2250738585072014e-308
>>> x == y
False

This is almost certainly an OS X bug...

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