Can it replace the jQuery dependency in Twitter Bootstrap?
hhmm... That would be a good test. I'll see if it works :)
Do provide an update here.
Looking through the javascript portion of Bootstrap, I would have to say that it may not work. I haven't fully tested the $.extend method yet, and since Bootstrap extends functionality of jQuery, it may not work. But I intend on working on that while keeping the gzip filesize of selector.js under 5kb.