Comment #12 on issue 1950 by [email protected]: Piecewise((x, 0 < x), (0, Eq(x, 0)), (-x, x < 0))._eval_interval(x, -1, 1) is wrong
http://code.google.com/p/sympy/issues/detail?id=1950
oh yeah I don't know how to use githubs pull requests. Anywho I updated it to https://github.com/sympy/sympy/pull/110
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