Comment #8 on issue 2376 by renato.c...@gmail.com: should subs use strict=True when sympifying?
http://code.google.com/p/sympy/issues/detail?id=2376
I'm just saying that: _eval_subs() methods don't have sympify args, that only happens in Basic._subs_old_new() (line 742 of basic.py). If it's not much of a compatibility break, you can disallow using strings as patterns, as you suggested, using sympify(old, strict=True) in that line.
I'm not sure if that's what you were asking, I'm confused because what I said is just what you proposed in the first place, right?
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