Comment #17 on issue 1053 by [email protected]: make sympify intelligent about 1/2 and 0.5
http://code.google.com/p/sympy/issues/detail?id=1053
A way to choose battles you can win (with converting floats to Rationals) is to convert only those that are exact in base 2: if m = log(n)/log(2) and m == int(m) then the float can be replaced without error as a Rational. e.g. 3/16 is exact, 0.1 is not. I do this in https://github.com/sympy/sympy/pull/1013 for Float generation from floats.
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