In the code below, 'check' is the function listed first in
`test_pickling`
>>> y = Symbol('y')
>>> y.is_commutative
True
>>> check(Symbol('y', commutative=False))
>>> y.is_commutative
False
>>> check(Symbol('y', commutative=True))
>>> y.is_commutative
False
>>> Symbol('y', commutative=True).is_commutative
False
Why is the assumption getting locked up? I'm guess this has to do with
__xnew_cached_ caching the Symbol but am not sure how to fix it (or
why Symbol but not Dummy uses __xnew_cached_).
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