[issue1580] Use shorter float repr when possible

[Guido van Rossum]

Guido van Rossum added the comment:

> Do you know of any system that supports Python and floats but doesn't
have IEEE 753 semantics?

(Assuming you meant 754.)

I'm pretty sure the VAX doesn't have IEEE FP, and it used to run Unix
and Python.  Ditto for Crays -- unsure if we still support that though.
 What about Nokia S60?

Tim probably knows more.

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priority: high -> normal

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