Comment #20 on issue 2026 by asmeurer: Exact, algebraic, and integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026
So I haven't read it deeply yet, but I get that the gist of Sebastian's idea was to make match contain all the intelligence wrt hints and to just have subs pass hints to match.
This is probably a good idea, though it only shifts my problem of hints implementation from subs to match.
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