Example that setting string values doesnt transform

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  init() {
   	const model = this.store.createRecord('my-model', {
      foo: '123',
      bar: '123'
    });
    this.set('my-model', model);
  }
});

models.my-model.js

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

export default Model.extend({
  foo: attr('string'),
  
  bar: attr('number'),
  
  fooType: computed('foo', function() {
    return typeof this.get('foo');
  }),
  
  barType: computed('bar', function() {
    return typeof this.get('bar'); 
  }),
});

templates.application.hbs

<h1>Example Setting Values on Model (number)</h1>
<br>
Foo: {{my-model.foo}}
<br>
Bar: {{my-model.bar}}
<br><br>
Foo Type: {{my-model.fooType}}
<br>
Bar Type: {{my-model.barType}}
<br>
{{outlet}}
<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"
  }
}