Comment #3 on issue 3068 by smi...@gmail.com: incorrect sign calculated http://code.google.com/p/sympy/issues/detail?id=3068
I'm not sure this error can be fixed. With the limited precision it may not be possible to calculate enough digits to shown the sign correctly(?)
The hanging and a problem with round(S(1)) has been fixed in https://github.com/sympy/sympy/pull/1064 .
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