Hi,

This is an awesome project! I'm trying to incorporate it into a codebase that has type checking done with mypy. It looks like the type hints aren't loaded because there's no py.typed file.

This generally requires creating a py.typed empty file and two extra lines in setup.py.

https://mypy.readthedocs.io/en/latest/installed_packages.html#creating-pep-561-compatible-packages

Is this something you would be interested in? I see there's some type hints already. It's not a bad idea to test the hints with mypy, either.

Thank you!