Remove data-iconshadow="false" from JQM Collapsible title

Remove data-iconshadow="false" from JQM Collapsible title

I have been trying to do this for a while with CSS and also data attributes but it is driving me up the wall. It's easy to remove data-iconshadow from buttons, but from collapsibles, not so.

In the Developer Console I can see JQM is applying "data-iconshadow='true'" even after I told it not to using this code (in several places):

  2.         <div data-role="collapsible-set" data-iconshadow="false">
  3.           <div data-role="collapsible" data-theme="f" data-collapsed-icon="baby" class="ui-icon-nodisc" data-iconshadow="false" data-expanded-icon="arrow-u">
  4.             <h2 data-iconshadow="false">0-12 Months</h2>
  5.             **insert content here**
  6.             </div>
  7.       </div>

And I'm not even sure how to target injected attributes with CSS so I am not having much luck with that either. Can someone please help me out and throw me a 'bone'?