sympy/sympy — pull request #8415 by skirpichev (2014-11-09 17:17:02+00:00)
Title: Add rational kwarg for Mul.as_coeff_mul, like for as_coeff_Mul

see #8399 (same pr, against the release branch)

--
this fix the printing problem, mentioned [here](https://github.com/sympy/sympy/issues/8398#issuecomment-62069573). The problem was introduced in #8305.