[issue3008] Let bin() show floats

[Mark Dickinson]

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

The patch looks good to me.

It's a bit unfortunate that -0.0 doesn't round-trip correctly (the sign 
of the zero gets lost):

>>> eval(bin(-0.0))
0.0

I don't know whether it's worth special-casing this;  the output would 
have to be in a different format:  '-0b0 * 2.0 ** 0' isn't good enough, 
since unary minus has higher precedence than multiplication.

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nosy: +marketdickinson

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