<blockquote>we're in sane-browser land</blockquote>
Are we? Did i miss some major announcement? That's a <code>1.x-master</code> branch, which means we still support IE6/7, and even if we didn't – that's behavior change.

@gibson042 Compare results of this <a href="http://jsfiddle.net/NAAP8/">example</a> with your code, especially in IE6/7.

We should add tests for this cases, but not removing support for them