Type hints

This project is typed, and types are checked using mypy, in strict mode. To check types use:

just type

If you’re adding a new (untyped) Python package, search for external type stubs and (if found) consider adding them to development requirements.

Do not use type: ignore excessively. Only ignore typing errors that cannot be resolved within the project (i.e., 3rd party package issues). When ignoring a typing error, be specific; avoid catch-all ignore statements and file-wide ignores.

Typing is also necessary for tests.