Comment #1 on issue 2245 by asmeurer: assumption while canceling the polynomials
http://code.google.com/p/sympy/issues/detail?id=2245
But the whole point of cancel is to cancel out common polynomial factors. Otherwise, it is useless.
Perhaps the functionality you mention could be useful, but I think it should be a separate function. For example, one of our GSoC student applicants suggested a function that handles cases like this (like cases(cancel, (x**2 - 3*x + 2/(x - 1)) or something).
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