Ember data merge issue

controllers.application.js

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

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  store: Ember.inject.service(),
  init () {
    const model = this.store.createRecord('my-model', {})
    
    Ember.merge(model, {foo: 'bar', bool: true})
    // model.setProperties({foo: 'bar', bool: true})
    this.set('data', model)
  }
});

models.my-model.js

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

export default Model.extend({
  foo: attr('string'),
  bool: attr('boolean')
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{data.foo}}
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}