The following non-exported but non-private names have been removed as they are
unneeded for supporting Python 3.6 and newer.
- TypingMeta
- OLD_GENERICS
- SUBS_TREE
- HAVE_ANNOTATED
- HAVE_PROTOCOLS
- V_co
- VT_co
Previous releases
Prior to release 4.0.0 we did not provide a changelog. Please check
the Git history for details.