Computed 'get' bug

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  wrapped: false,
  wrapper: Ember.computed('wrapped', {
 		get() {
    	return this.get('wrapped'); 
    },
    set(key,value) {
    	this.set('wrapped', value);
    }
  }),
  actions: {
    setWrapper(value) {
      this.set('wrapper', value);
    }
  }
});

application.template.hbs

<p>set wrapper value</p>
<button {{ action "setWrapper" true }}>true</button><button {{ action "setWrapper" false }}>false</button>

<p>
	Underlying value of wrapped: "{{wrapped}}"
</p>

<p> 
	Value of wrapper in template: "{{wrapper}}"
</p>

twiddle.json

{
  "version": "0.4.11",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "http://builds.emberjs.com/canary/ember.debug.js",
    "ember-template-compiler": "http://builds.emberjs.com/canary/ember-template-compiler.js"
  }
}