unfortunately, `assert_allclose` is a bit awkward to use because it compares the values directly, which is wrong here because the resulting PA is in radians, not degrees. Of course there's ways around this, but they look a bit more awkward... And this passed fine for me locally.  If the tests pass on all python versions, I think it's probably safe here, but if not I'll change it to use `assert_allclose` with the appropriate ``.to`` calls