michael@0: function foo(x) {
michael@0:    return !x;
michael@0: }
michael@0: 
michael@0: assertEq(foo({}), false);
michael@0: assertEq(foo({}), false);
michael@0: assertEq(foo(1.1), false);
michael@0: assertEq(foo(1.1), false);
michael@0: assertEq(foo(0.0), true);
michael@0: assertEq(foo(0.0), true);
michael@0: assertEq(foo(null), true);
michael@0: assertEq(foo(null), true);
michael@0: assertEq(foo(undefined), true);
michael@0: assertEq(foo(undefined), true);
michael@0: assertEq(foo(Infinity), false);
michael@0: assertEq(foo(Infinity), false);
michael@0: assertEq(foo(NaN), true);
michael@0: assertEq(foo(NaN), true);
michael@0: assertEq(foo([]), false);
michael@0: assertEq(foo([]), false);
michael@0: assertEq(foo(''), true);
michael@0: assertEq(foo(''), true);
michael@0: assertEq(foo('x'), false);
michael@0: assertEq(foo('x'), false);
michael@0: assertEq(foo(true), false);
michael@0: assertEq(foo(true), false);
michael@0: assertEq(foo(false), true);
michael@0: assertEq(foo(false), true);
michael@0: assertEq(foo(-0.0), true);
michael@0: assertEq(foo(-0.0), true);
michael@0: assertEq(foo(objectEmulatingUndefined()), true);
michael@0: assertEq(foo(objectEmulatingUndefined()), true);