Comment #37 on issue 1816 by Vinzent.Steinberg: Adding partial derivatives and taking derivatives with respect to functions
http://code.google.com/p/sympy/issues/detail?id=1816
I thing the most important thing is a clearly defined behavior. The docstring should mention that it does this substitution stuff when given a function as variable to differentiate for, ideally with a few doctests illustrating the behavior.
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