object-proxy-memory-leak?

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  modelProxy: null,
  updateCount: 0,
  
  setupProxy: Ember.on('init', function() {
  	this.updateProxy();
  }),
  
  updateProxy() {
    this.incrementProperty('updateCount');
  	var model = this.get('model');
    if (model != null) {
      var proxy = Ember.ObjectProxy.create({content: model});
      this.set('modelProxy', proxy);
    }
    Ember.run.later(this, this.updateProxy, 4);
  },
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
     model() {
        return Ember.Object.create({a: 1, b: 2, c: 3});
    }
});

templates.application.hbs

<p>Updates: {{updateCount}} (proxy is replaced each time this count is incremented)</p>
<p>Port of <a href="http://jsfiddle.net/501w8c3a/18/">http://jsfiddle.net/501w8c3a/18/</a> for <a href="https://github.com/emberjs/ember.js/issues/14802">https://github.com/emberjs/ember.js/issues/14802</a></p>
<ul>
    <li>{{modelProxy.a}}</li>
    <li>{{modelProxy.b}}</li>
    <li>{{modelProxy.c}}</li>
</ul>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.9.0"
  }
}