Comment #20 on issue 2307 by smi...@gmail.com: Duplicate methods: as_coeff_mul and as_coeff_Mul
http://code.google.com/p/sympy/issues/detail?id=2307
as_coeff_mul could be .rat_mulargs and as_coeff_add could be .rat_addargs. This would make it clear that you are getting a Rational, not "slot 0 coefficient' from the expression. I suppose the as_ could go in as a prefix, too.
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