Updates:
Labels: Logic
Comment #1 on issue 3337 by [email protected]: AssocOp uses _sympify,
LatticeOp sympify; sympify booleans
http://code.google.com/p/sympy/issues/detail?id=3337
The core issue is probably issue 2531. _sympify raises an error because we
don't actually have Basic classes for True and False. sympify() just
passes them through silently (as it does several other types, which is
something to consider if this is changed).
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