Ember.computed.oneWay issue

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return {name: 'sam'};
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  modelCopy: Ember.computed.oneWay('model'),
  
  actions: {
    actuallyChangeIt() {
      this.set('modelCopy', { something: 'else'});
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<p>Original Model: {{model.name}}</p>
<p>Model Copy: {{modelCopy.name}}</p>
{{input value=modelCopy.name}}

<button {{action 'actuallyChangeIt'}}>Actually change the modelCopy</button>

twiddle.json

{
  "version": "0.4.0",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.5/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.5/ember-data.js"
  }
}