Mocking binary responses with Ember Cli Mirage

mirage.config.js

export default function() {
  this.get('https://cors-anywhere.herokuapp.com/**', () => {
    return new Response(
      200,
      { 'Content-Type': 'image/png' },
      new Blob(['some data'])
    );
  });
}

routes.application.js

import Ember from 'ember';
import { inject as service } from '@ember/service';
import { assert } from '@ember/debug';

export default Ember.Route.extend({
  ajax: service(),
  
  model() {
    let url = 'https://cors-anywhere.herokuapp.com/https://www.emberjs.com/images/tomsters/emberconf-2018-85708f7b.png';
    
    return this.get('ajax').request(url, {
      dataType: 'binary',
      xhr() {
        let myXhr = jQuery.ajaxSettings.xhr();
        myXhr.responseType = 'blob';
        return myXhr;
      }
    }).then((response) => {
      if (response === undefined) {
        console.error('response should not be undefined');
      }
      
      return new Promise((resolve, reject) => {
        let reader = new FileReader();
        reader.addEventListener('load', () => {
          resolve(reader.result);
        }, false);
        reader.addEventListener('error', () => {
          reject(reader.error);
        }, false);
        reader.readAsDataURL(response);
      });
    });
  }
});

templates.application.hbs

<h1>How to mock a binary response expecting a <i>responseType</i> of <i>"blob"</i> with Mirage?</h1>
<p>Application route's model hook is fetching an image using <i>jQuery.ajax()</i>. It's working fine without Mirage. Tried to mock that request with Mirage by returning a <i>Blob</i> as response data. But in that case ajax request resolves with <i>undefined</i>. Please activate mirage in <i>twiddle.json</i> by setting <i>ENV['ember-cli-mirage'].enabled</i> to <i>true</i>. It's the fifth line of that file.</p>
<img src={{model}} />

twiddle.json

{
  "version": "0.15.0",
  "ENV": {
    "ember-cli-mirage": {
      "enabled": false
    }
  },
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-ajax": "3.1.1",
    "ember-cli-mirage": "0.4.9"
  }
}