Datasette currently has a few API internals that return sqlite3.Row objects. I was thinking about how this might work in the future - if Datasette ever expands beyond SQLite (plugin-provided backends for PostgreSQL and DuckDB for example) I'd want a way to return data from other stores using objects that behave like sqlite3.Row but are not exactly that class.
I don’t get this complaint.
Python is not adding typing, it’s just improving on its static type checker. Nothing is really changing at runtime. Even if your type annotations are completely wrong, your code will run just fine. It’s up for the developers and the team to know how much they will benefit from adopting it.