@hoechenberger I saw in a recent PR that @drammock added some missing type hints. I am not very experienced with type checking but this repo seems pretty well documented -- worth adding mypy to pre-commit or at least a CI run? I briefly tried both mypy and pyright and mypy was a little bit faster and used already by MNE so I'm inclined to try that.

I already see some annoyingness with TypedDict not subclassing dict but I'll look into that if type checking does seem worthwhile.