=====================
- The ``WithRepr`` decorator takes into account the updated default
repr of Persistent objects with persistent 4.4 and doesn't hide it.
- Subclasses of ``ExternalizableInstanceDict`` that have non-str
(unicode on Python 2, bytes on Python 3) keys in their ``__dict__``
do not throw ``TypeError`` when externalizing. Instead, the non-str
values are converted to strs (using ASCII encoding) and the
``_p_changed`` attribute, if any, is set.