* [3.5] bpo-32072: Fix issues with binary plists. (GH-4455)

* Fixed saving bytearrays.
* Identical objects will be saved only once.
* Equal references will be load as identical objects.
* Added support for saving and loading recursive data structures.
(cherry picked from commit a897aeee)

* Fix implementation dependent assertion in test_plistlib. (#4813)

It is failed with an advanced optimizer.