Comment #9 on issue 3536 by asmeu...@gmail.com: float NaN is not resolved with other numbers
http://code.google.com/p/sympy/issues/detail?id=3536
No, you can still get an overflow. SymPy allows arbitrary precision, but once it is set, it is fixed, so if the number you are computing goes beyond that precision, it will go to inf. Try exp(1e1000).
sympify does that because it creates the SymPy types (not float), which are better behaved, since they are used everywhere (whereas the float infinities are used rarely, hence these bugs).
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