Comment #13 on issue 3068 by smi...@gmail.com: incorrect sign calculated
http://code.google.com/p/sympy/issues/detail?id=3068
args that failed to eval were being allowed to rebuild a function and the
function didn't discriminate against them and so returned what appeared to
be a genuine value. e.g. if 0.e308 is a failed evaluation of a small
number; sign(0.e308) -> 1. That failed number shouldn't have been used to
calculate the sign, however.
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