michael@0: function f(v, value)
michael@0: {
michael@0:   var b = v == null;
michael@0:   assertEq(b, value,
michael@0:            "failed: " + v + " " + value);
michael@0: }
michael@0: 
michael@0: f({}, false);
michael@0: f({}, false);
michael@0: f(null, true);
michael@0: f(null, true);
michael@0: f(undefined, true);
michael@0: f(undefined, true);
michael@0: f(objectEmulatingUndefined(), true);
michael@0: f(objectEmulatingUndefined(), true);
michael@0: f(Object.prototype, false);
michael@0: f(Object.prototype, false);
michael@0: 
michael@0: function g(v, value)
michael@0: {
michael@0:   var b = v == null;
michael@0:   assertEq(b, value,
michael@0:            "failed: " + v + " " + value);
michael@0: }
michael@0: 
michael@0: g({}, false);
michael@0: g({}, false);
michael@0: 
michael@0: function h(v, value)
michael@0: {
michael@0:   var b = v == null;
michael@0:   assertEq(b, value,
michael@0:            "failed: " + v + " " + value);
michael@0: }
michael@0: 
michael@0: h(objectEmulatingUndefined(), true);
michael@0: h(objectEmulatingUndefined(), true);