Comment #11 on issue 2133 by mattpap: Merge new polynomials manipulation module
http://code.google.com/p/sympy/issues/detail?id=2133
This is what Python devs wrote in bugs.python.org. This is of course correct explanation but in this (an a few other) special case the algorithm could return exact values or at least be consistent between ints and longs. But, as they are explicit about this, in future I will assume I have to do all this on my own.
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