Comment #13 on issue 1844 by [email protected]: expand methods pruned
http://code.google.com/p/sympy/issues/detail?id=1844
If I remove that code, the cache still contains different items (as you
said) but the hashes are the same. I'm not sure where/how that is happening:
hash(Symbol('x',positive=1)), hash(Symbol('x',positive=True))
(<class 'sympy.core.symbol.Symbol'>, 'x', True, ('positive=', 1))
(<class 'sympy.core.symbol.Symbol'>, 'x', True, ('positive=', True))
(1872342363, 1872342363)
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