Implement PEP 696 (Type parameter defaults)
Feature or enhancement
Implement PEP-696, which was just accepted.
Off the top of my head, we'll need the following:
- Grammar changes
- Changes in typing.py to type parameter application logic
- Documentation
I'll work on the first one but contributions on the other two are appreciated. The implementation in typing-extensions can serve as an inspiration.
cc @Gobot1234