Feature or enhancement

typing.Annotated is currently implemented as a class, but doesn't need to be. All other objects like it in thetyping module are implemented as instances oftyping._SpecialForm, and we can do the same here. This simplifies the code a lot (making it easier to maintain in the future), and should also beslightly more performant.

Linked PRs

• gh-105509: Simplify the implementation oftyping.Annotated #105510