#each re-render bug

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  init() {
    this._super(...arguments);
    this.set('range', Array(5));
  },
  
  makeChange(idx) {
    console.log('makeChange', idx);
    const range = this.get('range').slice(0);
    range[idx] = !range[idx]
    console.log('range', range);
    this.set('range', range);
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<h2>Without key="@index"</h2>
{{#each range as |value idx|}}
  <label><input type="checkbox" checked={{value}} {{action makeChange idx on="change"}}>{{idx}}: {{value}}</label><br/>
{{/each}}
<br>
<h2>With key="@index"</h2>
{{#each range key="@index" as |value idx|}}
  <label><input type="checkbox" checked={{value}} {{action makeChange idx on="change"}}>{{idx}}: {{value}}</label><br/>
{{/each}}
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}