[ARIA] aria-disabled and child elements

The spec says [1] that children of an element with aria-disabled=true will
inherit the disabled state

In this example[3] the link is flagged as disabled (in Firefox)

<div aria-disabled="true">
  <a id="link1" href="#">link</a>
</div>

In this example the checboxes are flagged as disabled (in Firefox), note
the 2nd checkbox has aria-disabled=false set.

<div role="group" aria-label="disabled fieldset" aria-disabled="true">
  <input type="checkbox"><br>
  <input type="checkbox" aria-disabled="false">
</div>

question:

In example 2 above, should the checkbox with aria-disabled=false override
the disabled=true flag of its parent?

[1] http://rawgit.com/w3c/aria/master/aria/aria.html#aria-disabled
[2] https://code.google.com/p/chromium/issues/detail?id=467501
[3] working example http://codepen.io/stevef/pen/PwxjpY
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Regards

SteveF
HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>