smichr/sympy — comment on commit 91bd693fee036288b8386b8d6fa4e10ba1c32064
File:  line 0
By smichr:

>
> This changes the API. What is the motivation for it?
>
>
http://groups.google.com/group/sympy/browse_thread/thread/b67c275f7a4bb1fa/37723b7d7d091fd4?lnk=gst&q=875#37723b7d7d091fd4

From a design point of view, there's no good reason to not return the same
thing that was input, is there?