Comment #1 on issue 2385 by asmeurer: Refactor Basic.sorted_key http://code.google.com/p/sympy/issues/detail?id=2385
It seems to me that this either be moved to Expr or not contain so much knowledge of specific Expr classes.
Ronan, why does this need to be done before the release (other than the name issue, which I don't mind either way because there is both sorted() and a.sort())?
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