I want to emphasize for folks reading: if you want actual type enforcement and you want that type enforcement with minimum boilerplate, Pydantic is a fantastic option (I'm sure there are others as well). It's a great library that's totally use-agnostic (it's not HTTP specific, you can use it for whatever) and quite tight. Caveats are that it uses runtime validation to enforce types so there's a performance cost, but it's a performance hit that is mostly eclipsed by all the other huge performance hits that litter your typical Python implementation.

Pydantic is amazing!