Tooltip Widget breaks in IE

jQuery Version: 1.9.1

jQuery-UI Version: 1.9.2

Browser: IE8

OS: Windows

Steps to see what I'm talking about:

1. Go here in chrome: http://jsfiddle.net/EP5Jx/#run

2. Pull up Chrome Dev Tools -> Sources -> Open jquery-ui.js

3. Add a break point on line 842 where it says

• hasOptions = !$.isEmptyObject( options );

4. Hover over where it says "Some text"

5. The code should stop at the break point, check the value of options. It is true.

Now, according to the documention of $.isEmptyObject (http://api.jquery.com/jQuery.isEmptyObject/)

The argument should always be a plain JavaScript Object as other types of object

(DOM elements, primitive strings/numbers, host objects) may not give consistent

results across browsers.

The boolean value of true is definitely not a plain JS Object and this actually does cause issues in IE. To see:

1. Go to msn.com in Internet Explorer 8

2. Pull up dev tools

3. Switch Browser Mode to "IE8 Compat View"

4. Switch Document Mode to "IE7 Standards"

5. Switch to Script tab

6. run the following script: true.toJSON()

running that script returns true because for some unknown reason the boolean value true has a method associated with it. In this weird case calling $.isEmptyObject(true) will actually return false when for any other browser it would return true, and in this case the widget will break.

Sorry I was unable to give straight-forward directions to reproduce this. This is the first time I've logged a jquery bug.