Comment #6 on issue 2641 by [email protected]: limit() heuristics are wrong http://code.google.com/p/sympy/issues/detail?id=2641
My initial feeling is that limit should do preprocecssing needed so it can accurately decide whether guntz is needed. You have identified a case where it makes sense to work with the combined (as_numer_denom or together0 version of the expression. So I would see where that isn't happening in limit, try make the change, see what happens. The tests will let you know whether you found a generally valid addition or an exceptional situation that needs more careful handling.
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