Fun fact: This transpiles directly to:  ``` this._super.apply(this, arguments); ```  Which is **awesome**. Elsewhere in ember we use (and I am far less crazy about):  ``` registry.register('component:x-outer', Component.extend({    init(...args) {     this._super(...args);     outer = this;       }  })); ```  Which builds an intermediate array of args before unrolling. 