Comment #10 on issue 3025 by ronan.l...@gmail.com: Piecewise evaluate=False does not work when conditions are boolean
http://code.google.com/p/sympy/issues/detail?id=3025
I'd rather base the discussion on the existing behaviour (and ignore the difference between evaluating to nan and raising ValueError), because there are things in Sean's branch I don't understand at all, such as "Piecewise((x, x > 1), (0, True), nan) in Sean's branch evaluates to 0, because (0, True) is parsed as an expr, cond pair, and since the condition is True, it returns the expression." I don't see why the 2nd condition being True should cause the Piecewise to evaluate to 0.
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