Debounce Issue

application.controller.js

import Ember from 'ember';

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

application.route.js

import Ember from 'ember';

const { run: { debounce } } = Ember;

export default Ember.Route.extend({
  
  runMe() {
    console.log("I should be called once");
  },
  
  actions: {
    runMe() {
      debounce(this, this.runMe, 3000, true);
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

<p>Focus the input and hold return/enter key on your keyboard. It prints twice to console, before starting to debounce</p>

<form {{action 'runMe' on='submit'}}>
  <input type="text"/>
  <button type="submit">Submit</button>
</form>

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}