Thread:Extension talk:Cite/Tooltip

Just noticed the tooltip.js on the extension. can the developers explain why they chose to ignore "tipsy", which is a jquery extension that's included in the mediawiki package, and instead chose to develop their own tooltip package? this does not make sense to me, unless there is a reason to think tipsy is somehow broken, or there is some reason to believe it might not be available on all mediawiki installations. (for a gadget that use tipsy to display reference tooltips, see w:he:Mediawiki:Gadget-CiteTooltip.js)