[issue1580] Use shorter float repr when possible

[Noam Raphael]

Noam Raphael added the comment:

‎That's right, but the standard also defines that 0.0/0 -> nan, and
1.0/0 -> inf, but instead we raise an exception. It's just that in
Python, every object is expected to be equal to itself. Otherwise, how
can I check if a number is nan?

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