Comment #10 on issue 3006 by [email protected]: sign(Symbol('z', zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
Well, if you think it should be changed back, we can discuss it. We really need to consider how things will work in the new assumptions. I guess there, it makes less sense to automatically make Symbol("x", zero=True) to automatically give 0, because assumptions are separate from symbols, and can change after their instantiation.
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