title: comparing javascript FormData object
body: <p>How do I compare FormData object, I am trying to check if the form has been changed or not before sending the ajax request.</p>
  
  <p>But it seems objects cannot be compared. Is there any way to convert it to js Object or an elegant way?</p>
  
  <pre class="lang-js prettyprint-override"><code>let a = new FormData()
  let b = new FormData()
  
  console.log(a === b ) // returns false
  </code></pre>