Looking at the coverage report posted on Codecov (and what's visible locally), it says that https://app.codecov.io/github/aio-libs/frozenlist/commit/d92751c796094f6d4afecad91b65ec98a3bb9201/blob/frozenlist/__init__.py#L26 and https://app.codecov.io/github/aio-libs/frozenlist/commit/d92751c796094f6d4afecad91b65ec98a3bb9201/blob/frozenlist/_frozenlist.pyx#L13 aren't covered.
These lines are effectively the only ones in the main frozenlist package that are marked as not covered.

Any ideas why that is? cc @mjpieters @Dreamsorcerer @bdraco

I was hoping that maybe MyPy would cover it, but it doesn't either. I'm quite puzzled. FWIW, Codecov now displays MyPy coverage, which reveals some partial typing that needs to be looked at too.