there maybe a memory leak about deferred in 3.x

When our project upgraded to jQuery3.2.1 (from 2.2.4), we found a memory leak about  Deferred  in jQuery3.x . the  promise.then  method does not release the handler & handler Closure .
it work well in jQuery2.x and native Promise in chrome .

look at the following case：

http://plnkr.co/edit/DpMkLV2mqzwlX4Ruuk7i

• Topic Participants

• houfeng0923