[GiNaC-list] normalization ambiguity

I recently discovered that expressions like pow(x - y, 2) can normalize to pow(y - x, 2) if y compares less than x (according to the ex_is_less comparator). Is this behavior deliberate? A particular test in the test suite (check/exam_normalization.cpp) normally only passes when pow(x - y, 2).normal() == pow(x-y, 2). Thanks, -Jonathan