Attribute watchers never fire on "native" attributes?

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In Polymer (0.5.2) it appears that global HTML attributes, like lang, cannot be cleanly observed? For instance:

<polymer-element name="x-foo" attributes="lang bar">
  ..
  <script>
    Polymer({
        langChanged: function () .. // never fires by itself
        barChanged:  function () .. // fires just fine
    });
  </script>
</polymer-element>

The interesting part is that the callback does fire if the element is dirtied in other ways. For example:

..
ready: function () {
  this.lang = 'en';
}
..

This does not trigger any callback. However:

..
ready: function () {
  this.lang = 'en';
  this.bar  = 'baz';
}
..

This fires both callbacks. So it appears that Polymer isn't correctly being notified about changes to "native" attributes? Is this a known issue? Can this be worked around?

asked 1 min ago

deceze

220k

Attribute watchers never fire on "native" attributes?