Comment #6 on issue 3130 by [email protected]: Unpickling a Symbol with protocol 2 corrupts the cache
http://code.google.com/p/sympy/issues/detail?id=3130
I see what you're saying. Would that require modifying the way the caching system works?
I suppose one other advantage that we would lose here is that caching also saves memory, by returning the exact same object. But it's probably a rare use-case where someone uses a lot of symbols with the same name that are completely separate in memory. An example that comes to mind is recreating an expression from srepr().
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