Comment #3 on issue 3316 by [email protected]: Expr.expand: the result depends on the order in which hints are traversed.
http://code.google.com/p/sympy/issues/detail?id=3316
I should also point out that issue 3338 would let us prevent expansion in the first place, which would make expansion much faster. For example, if expr._can_expand_log gives False, because the expression has no logs in it, then the log hint can be skipped entirely during expansion.
Regarding non-idempotent expansion methods, I can't think of any real world examples, but the doctest example from the expand() docstring would be an example. That just doubles the args, something that could be done forever and always result in a changed expression.
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