Comment #83 on issue 1694 by asmeurer: solve has many issues with fractions http://code.google.com/p/sympy/issues/detail?id=1694
+1 on changing S.Integer.__hash__. I'll create a new issue for that (it will probably be issue 1973).
What happens if I do some modification locally, and use git fetch after ?
Basically what Vinzent said: If you want to commit changes on top of a remote repository, you should create a local branch for it. So if you are checked out to smichr/nic, you can do git checkout -b nic, and it will create a local branch called nic. If you have a recent enough version of git, it should give you a message to this effect whenever checkout a remote branch. git pull will then update that local branch in one step, as long as you haven't changed it. Also, if you have the git command line prompt (see http://groups.google.com/group/sympy/browse_thread/thread/cc56533725278fa3/7c416f1730af2754) you should only commit when it shows a branch name, not a sha1 hash (this will also warn you when you are rebasing, and git you command completion for git, too).
The one disadvantage that I could see for sets over lists is that you can't reference items in a set. So you may not want the solutions to be sorted in any particular way, but you might want them sorted in the sense that sols[0] is always the same. Probably it doesn't warrant not returning a set, though, and we should definitely use sets when testing, to avoid unnecessary headache.
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