EmberComputed aggregation not working

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  proxyList: Ember.A([
  {name: 'minh', expired: true},{name: 'van', expired: true}, {name: 'spree', expired: true}
  ]),

	allExpired: Ember.computed('[email protected]', {
    get() {
      return this.get('proxyList').isEvery('expired', true);
    },
    set(n, v) {
      this.get('proxyList').forEach((item) => {
        Ember.set(item, 'expired', v);
      });
    }
  })
	
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
All: {{allExpired}} {{input type="checkbox" checked=allExpired}}
<br>
{{#each proxyList as |item|}}
	{{item.name}}: 
  {{item.expired}}
  {{input type="checkbox" checked=item.expired}}
{{/each}}
<br>
<br>

twiddle.json

{
  "version": "0.6.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.13",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "1.13.13"
  }
}