Notify Property Change Doesn't Force a Rerender

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Notify Property Change Doesn\'t Force a Rerender',
  value: null,
  actions: {
    set(value) {
      this.set('value', value);
    },
    validate() {
      if (this.get('value') !== 'valid') {
        this.set('value', 'valid');
      }
    }
  }
});
	

templates.application.hbs

<h1>{{appName}}</h1>
<br>
<br>
{{outlet}}
<input value={{value}} onchange={{action "set" value="target.value"}} onblur={{action 'validate'}}>
<button {{action "set" null}}>Set Value to null!</button>
<button {{action "set" "foo"}}>Set Value to Foo!</button>
<br>
<br>
validated: {{validatedValue}}

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}