Comment #4 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
Is it possible to disable caching at the instantiation from pickling? That seems to be the only way around the problem (unless you can somehow make it instantiate in a way other than Symbol(*args)).
I suppose we could use some kind of hack where we put everything in args, and don't rely on __setstate__ at all.
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