[jquery-ui] Datepicker under 1.7.2 triggers the mouseover event when .datepicker called, is this desired?

I just upgraded from 1.6.1 to 1.7.2 and suddenly had a bunch of very
strange behaviors appear that I finally traced to the initialization
of some datepickers on the page.  Apparently when datepickers are
initialized, they seem to fire the mouseover event on one of the leaf
<a> nodes (the individual day links).  Wrapper containers around the
datepicker hear this mouseover event, which at least in my app causes
some problems.  I can work around it, but is this desired behavior?
Or am I triggering this in some other way?  If this is indeed firing a
mouseover, why would we want the mouseover event automatically fired
in this case?  Seems like a dangerous practice.

I've managed to isolate a test case as follows:

js:

$(function(){
        // bind a listener to check if the wrapper element hears the
mouseover
        $('#wrapper').bind('mouseover', function(){
                console.log('mouseover called');
        })

        //initialize a datepicker
        $('#testDatepicker').datepicker();
});

html:
<div id="wrapper">
        <div id="testDatepicker"></div>
</div>
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