[minor] Fix nits

Author: lpinca

lib/event-target.js

@@ -122,16 +122,12 @@ const EventTarget = {
    * @param {Function} listener The listener to add
    * @param {Object} [options] An options object specifies characteristics about
    *     the event listener
-   * @param {Boolean} [options.once=false] A `Boolean`` indicating that the
+   * @param {Boolean} [options.once=false] A `Boolean` indicating that the
    *     listener should be invoked at most once after being added. If `true`,
    *     the listener would be automatically removed when invoked.
    * @public
    */
-  addEventListener(
-    type,
-    listener,
-    options = { once: false, [kForOnEventAttribute]: false }
-  ) {
+  addEventListener(type, listener, options = {}) {
     let wrapper;
 
     if (type === 'message') {
@@ -155,7 +151,7 @@ const EventTarget = {
       return;
     }
 
-    wrapper[kForOnEventAttribute] = options[kForOnEventAttribute];
+    wrapper[kForOnEventAttribute] = !!options[kForOnEventAttribute];
     wrapper[kListener] = listener;
 
     if (options.once) {