Selectmenu ignores hidden attribute

Using plain Javascript, it is easy to hide a select-menu option using HTML5's hidden attribute. But when stylising the select-menu using the jQuery-UI, the hidden attribute is ignored. For example, define two select menus:

<select id="one">
  <option>option 1</option>
  <option>option 2</option>
  <option hidden>hidden option</option>
  <option>option 4</option>
</select>

<select id="two">
  <option>option 1</option>
  <option>option 2</option>
  <option hidden>hidden option</option>
  <option>option 4</option>
</select>

using the following Javascript/jQuery:

$(function(){            
  $('#one').selectmenu();
});

When you run this example, the third item is hidden in the second selectmenu, but not in the first. It seems that jQuery-UI has disabled the hidden attribute. See

http://jsfiddle.net/pvermees/xa4219ya/1/

for a live example of this issue.