Comment #9 on issue 3006 by [email protected]: sign(Symbol('z', zero=True)) -> sign(z)
http://code.google.com/p/sympy/issues/detail?id=3006
The assumption mechanism naturally supports having a symbol representing zero, so I don't see a reason to disallow it (and even less so if it involves resolving assumptions that are not explicit). But since I missed the discussion about that issue, I'll just let it rest.
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