Range Slider Working - Ember 1.13.6

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  _minZoom: 1,
  _maxZoom: 5,
  zoomLevel: 1,
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<p>Drag the slider to see the bound property change</p>
<p>This, by default is on 1.13.6. If you change twiddle.json to be 1.13.7, this no longer works.</p>
<br>
{{my-component}}
<br>
<br>

templates.components.my-component.hbs

<div>{{input classNames='zoom-slider' type='range' min=_minZoom max=_maxZoom step=1 value=zoomLevel}}</div>

<div>
	<h2>zoom level is {{zoomLevel}}</h2>
</div>

twiddle.json

{
  "version": "0.4.7",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.7/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember-template-compiler.js"
  }
}