Symbol.prototype.identity = function () { "use strict"; return this; }; noInline(Symbol.prototype.identity); Symbol.prototype.identity2 = function () { "use strict"; return this; }; for (var i = 1; i < 1e4; ++i) Symbol.prototype.identity.call(Symbol(i)); for (var i = 1; i < 1e4; ++i) Symbol.prototype.identity2.call(Symbol(i));