Trac ticket #22029 changes the coercion model such that comparisons of
Element instances now behave like in Python 3. This means that
comparisons of elements with uncomparable types/parents will raise an
error instead of returning some random answer. I believe that this is an
important step in making Sage ready for Python 3.
We could have chosen to use Python 2 style comparisons under Python 2
and Python 3 style comparisons under Python 3, but that would inevitably
lead to regressions on Python 3. It's best if code behaves as much as
possible the same under Python 2 and Python 3.
The change in the code is quite small, but the implications are big, so
that's why I wanted to mention it here on sage-devel.
Jeroen.
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