Comment #35 on issue 1598 by asmeurer: New polynomials manipulation module
http://code.google.com/p/sympy/issues/detail?id=1598

You are right.  fraction() is like as_numer_denom() except for a  
little "magic", but I think we should move all of the code there into
as_numer_denom() as it is duplicated (actually the only "magic" it performs  
that as_numer_denom doesn't as far as I can tell is that
it handles assumptions on variable exponents, which as_numer_denom should  
maybe be doing the same with a similar keyword
argument.  See issue 1731).

To Chris, separatevars() does want to use normal factor.  That way, it can  
separate 1 + x + y + x*y.  If you are doing it right, you
should see a nice xpass test for it with the new polys module (actually it  
needs to be fixed to not bother with PolynomialError
anymore).

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