Comment #28 on issue 2307 by asmeurer: as_coeff_mul()[0] != as_coeff_Mul()[0] when the coeff is Number (not Rational)
http://code.google.com/p/sympy/issues/detail?id=2307
By the way, I just noticed when looking at https://groups.google.com/d/topic/sympy/4Pt1V322RHw/discussion that Add.flatten does not use as_coeff_Mul, but its own routine. Is there a good reason for this?
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