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I have the following line in a unit test in 2.7.3:
 self.assertItemsEqual(['a', 'b', 'c'], ['a', 'b', 'c', 'd'])
I expect this output:
 AssertionError: Element counts were not equal:
 First has 0, Second has 1: 'd'
Instead I get this output:
 AssertionError: Element counts were not equal:
 First has 1, Second has 0: 'd'
I would expect 'First' to refer to the first sequence I pass to assertItemsEqual, not the second, and vice versa.
(Obviously in a trivial example like this it appears unimportant, but when debugging why a test has failed, the unexpected ordering can cause problems.)