Deferred.promise( target) should work fine for any type of target except null and undefined.

Before version 1.8.0 (i used version 1.7.2) you could do

var tracker = $.Deferred();

var foo = function() {

};

foo = tracker.promise( foo);

foo();

Since version 1.8.0 the same code returns just the promise instead of the extend function.

Should be easy to fix.