Failed computed value coercion

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
   updateValue(event) {
     let newValue = event.target.value;
     let sanitizedValue = newValue.replace(/[^a-zA-Z0-9-]/, '');
     if (newValue !== sanitizedValue) {
       event.target.value = sanitizedValue;
     }
     
     this.set('computedValue', sanitizedValue);
   }
  }
});

templates.application.hbs

<p>Value: "{{computedValue}}"</p>

<input value={{computedValue}} oninput={{action 'updateValue'}} >

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"
  }
}