Bug: Mirage + each-in helper

adapters.dog.js

import Ember from 'ember';
import DS from 'ember-data';

export default DS.RESTAdapter.extend({

});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({

});

mirage.config.js

export default function() {
  window.server = this;

  this.get('/dogs', function(schema, request){
    var dogs = [{
      id: 1,
      name: 'Snoopy'
    }, {
      id: 2,
      name: 'Balto'
    }];
    return {
      dogs: dogs
    };
  });
};

models.dog.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name: DS.attr('string'),
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.get('store').findAll('dog');
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

templates.application.hbs

<header>
  <h3> Mirage each-in bug</h3>
</header>

<h5> Broke </h5>
<ul>
{{#each model as |dog|}}
  <li>
    <ul>
    {{#each-in dog as |key value|}}
      <li>{{key}} {{value}}</li>
     {{/each-in}}
     </ul>
  </li>
{{/each}}
</ul>

<h5> Works </h5>
<ul>
{{#each model as |dog|}}
  <li>
    <ul>
    {{#each-in dog._internalModel._data as |key value|}}
      <li>{{key}} {{value}}</li>
     {{/each-in}}
     </ul>
  </li>
{{/each}}
</ul>

twiddle.json

{
  "version": "0.11.3",
  "ENV": {
    "ember-cli-mirage": {
      "enabled": true
    }
  },
  "EmberENV": {
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.0",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.0"
  },
  "addons": {
  	"ember-cli-mirage": "0.2.8"
  }
}