Mixin event handler is shadowed

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle'
});

application.route.js

import Ember from 'ember';
import MyMixin from 'demo-app/my-mixin';

export default Ember.Route.extend(MyMixin, {
  actions: {
    myEvent() {
      console.log('handled by route');
      return true;
    }
  },
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<button {{action 'myEvent'}}>send <code>myEvent</code></button> 
<p>On clicking the above button, I'd like the console to print the following (in either order):</p>

<pre>
handled by mixin
handled by route
</pre>

<p>However, only the first message appears. This is because the action handler at ApplicationRoute is shadowed by the one in MyMixin.</p>

<p>In my application, the event I'm trying to handle is 'willTransition'. This problem creates a situation where I cannot have a Mixin with a common handling case for this event, and use it on a route that has its own handling of this, where both should apply.</p>


<br>
{{outlet}}
<br>
<br>

my-mixin.js

import Ember from 'ember';

export default Ember.Mixin.create({
  actions: {
    myEvent() {
      console.log('handled by mixin');
      return true;
    }
  },
});

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}