Comment #3 on issue 1239 by [email protected]: decimals should be rationals (!)
http://code.google.com/p/sympy/issues/detail?id=1239
In the pull request I cite, Floats store the instantiation value in _raw, so they could answer True for is_rational by seeing if _raw was a string or Rational (and exact floats are stored as the equivalent Rational, so Float(3/16)'s _raw value is Rational(3, 16)...but how would you use that information in sympy?
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