I copy/pasted a batch of 10 File documents. There is a leak of DocumentModelImpl.
The references seem to be held from a hash map in CoreEventService (pending_events I think).
This map still has events like aboutToCopy long after it's been done.
"Exclusive deep size" of leaked objects is minor compared to other leaks in the application, but needs to be done
(masking effect for other leaks)