I think it worth sending to the main mailing list one way or another. There has been a lot of discussion on the sympy-patches list which probably doesn't have the visibility of the sympy list. I think the problems with the different approaches have been covered here, so it is worth hearing what other developers or users of sympy think. I am still OK with the original idea of using parameters as strings. I like the convenience of using f(x=1) to evaluate an expression. I believe that reasonable documentation would help alleviate some of the confusion. I don't have experience with using the kind of hack suggested by Riccardo, so I don't know the pitfalls, but it was a pretty cool way to get around the problem raise by Riccardo. However, it is probably a good idea to get a better picture of what a more general audience thinks about how to handle this.
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