Even if all event handlers are removed with .off(), an empty cache entry is left in data_priv. Unfortunately, those empty cache entries remain if elements are removed using some method other than .remove(), causing a memory leak.

Test Environment: \\\\

Chrome 31.0.1650.63, jQuery 2.0.3

Steps to Reproduce:\\\\

1. Attach an event handler to an element (e.g. using .on())

2. Remove the event handler with .off()

3. Remove the element with Node.removeChild()

Expected Results:\\\\

No memory leaks.

Actual Results:\\\\

An orphaned cache entry remains in data_priv.

Example:\\\\

http://jsfiddle.net/Rx3v3/

Additional info:\\\\

Modifying the last block of jQuery.event.remove() as below seems to alleviate the problem.

#!js
// Remove the expando if it's no longer used
if ( jQuery.isEmptyObject( events ) ) {
    delete elemData.handle;
    data_priv.remove( elem, "events" );

    // Clean up empty cache entries:
    delete data_priv.cache[elem[data_priv.expando]];
}