Comment #16 on issue 2461 by asmeurer: sort_key() should only return
comparable built-in Python objects
http://code.google.com/p/sympy/issues/detail?id=2461
This doesn't cause any test failures, other than the ones that are already
in master.
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Comment #15 on issue 2461 by asmeurer: sort_key() should only return
comparable built-in Python objects
http://code.google.com/p/sympy/issues/detail?id=2461
A possible fix for one place where this was happening:
https://gist.github.com/1208834.
I'm not sure if that's the best way, though.
