Comment #2 on issue 3337 by [email protected]: AssocOp uses _sympify, LatticeOp sympify; sympify booleans
http://code.google.com/p/sympy/issues/detail?id=3337
OK, after a little thought, I think AssocOp is the wrong class to use, at least without some modification of the class structure. The reason is that AssocOp is a subclass of Expr, but the boolean classes are not (or at least they shouldn't be). So the *correct* fix probably involves some splitting/rearranging of the class structure. Unfortunately, the logic is a part of the core that gets relatively little love, and as such, the class structure there is a in a little bit of a mess.
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