title: How to customize jQuery formBuilder typUserAttrs
body: <p>I've implemented a Rails app with a new feature including a custom form, which I choose jQuery formBuilder as the first option among other plugins. I know I can customize values of each <code>typeUserAttrs</code>, but what I want is to hide or disable some of them. </p>
  
  <p>For example: <code>class</code><br>
  A simple user might not know what the <code>class</code> does, while we developers use it for styling, etc.</p>
  
  <p>The docs or the plugin itself has a <code>disableFields</code> option, so I think it should have a <code>disableTypeUserAttrs</code>.</p>
  
  <p>Please correct me if I misunderstood documentation. The desired option might exist, but I did not find it.</p>