michael@0: // Different representations of the same number or string are treated as the same Map key.
michael@0: 
michael@0: var m = new Map;
michael@0: var test = function test(a, b) {
michael@0:     m.set(a, 'secret');
michael@0:     assertEq(m.get(b), 'secret');
michael@0:     m.set(b, 'password');
michael@0:     assertEq(m.get(a), 'password');
michael@0: 
michael@0:     assertEq(a, b);
michael@0: };
michael@0: 
michael@0: // Float and integer representations of the same number are the same key.
michael@0: test(9, Math.sqrt(81));
michael@0: 
michael@0: // Ordinary strings and ropes are the same key.
michael@0: var a = Array(1001).join('x');
michael@0: var b = Array(501).join('x') + Array(501).join('x');
michael@0: test(a, b);
michael@0: 
michael@0: // Two structurally different ropes with the same characters are the same key.
michael@0: a = "";
michael@0: b = "";
michael@0: for (var i = 0; i < 10; i++) {
michael@0:     a = Array(501).join('x') + a;
michael@0:     b = b + Array(501).join('x');
michael@0: }
michael@0: test(a, b);