michael@0: // Number keys are distinct from string keys that would name the same property.
michael@0: 
michael@0: var s = new Set;
michael@0: 
michael@0: s.add(17);
michael@0: assertEq(s.has("17"), false);
michael@0: assertEq(s.has(17), true);
michael@0: s.add("17");
michael@0: assertEq(s.delete(17), true);
michael@0: assertEq(s.has("17"), true);
michael@0: assertEq(s.has(17), false);