Comment #11 on issue 2081 by asmeurer: Pow substitution introduces wrong answers
http://code.google.com/p/sympy/issues/detail?id=2081
Well, I think it makes sense to keep that implementation still encapsulated within the subs method. The ideal solution here in my opinion would be to have some kind of hints system to subs, so you can do (x**3).subs(x**2, algebraic=True) (or whatever hint name), and it would work like it does now.
Actually, it turns out that I need to ability to turn this on and off for exp() specifically (which is very similar to Pow, except that I don't think it is ever actually invalid assumptions-wise). This is one of the key things blocking issue 2010.
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