Comment #7 on issue 3028 by asmeu...@gmail.com: fnan and NaN print the same http://code.google.com/p/sympy/issues/detail?id=3028
float(S.NaN) would have to return float('nan') (the built-in type). He's saying that S.NaN.evalf() should return S.NaN, and that fnan should no longer exist.
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