Function wrapper

test/fixtures/compile-performance.js:42896–42900

(get)

            , InternalMap;

        var wrapper = function(get){
            return function WeakMap(){
                return get(this, arguments.length > 0 ? arguments[0] : undefined);
            };
        };

        var methods = {
            // 23.3.3.3 WeakMap.prototype.get(key)