Perspective Table rowIndex vs row

I have been looking in the documentation, and cant seem to find it, but what is the difference between rowIndex and row in the implicitly provided embedded view column parameters?

row is typed as number | string, so I guess in some circumstance it could be a string - where rowIndex is guaranteed to be a number.

Oh alright, but they are both references to the index of a row in the data property?

For some reason I remember one of them being a reference to the number of the row visualized on the screen, but I have no idea where I got that from