Failed computed value coercion

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  computedValue: Ember.computed({
    get() {
      return 'Hello';
    },
    set() {
      return 'World';
    }
  }),

  computedValueChanged: Ember.observer('computedValue', function () {
    Ember.Logger.info('Value changed: ', this.get('computedValue'));
  })
});

templates.application.hbs

<p>Value: "{{computedValue}}"</p>
{{input value=computedValue }}

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}