py3.8: reversed() on dicts, keys, items and values
The requested feature is already correctly implemented for
collections.OrderedDict, although the objects returned by
reversed() are not picklable yet (which is not that bad).
The feature is used e.g. by snakeoil library, which does not currently support pypy.
- https://bugs.python.org/issue33462 describing the change in CPython
https://docs.python.org/3.8/library/stdtypes.html#dict (search for "