Johanna Sörngård

If this were implemented with the types in this crate I would map each row to an `EnumeratePixels(Mut)` instead of a normal slice iterator.

I think I personally would prefer that API as it would allow, as you say, the user to call either `iter` or `par_iter` on the slices, which gives more options...

I think it is a good idea to have them be consistent, since then you can just add a `par_` in front and magically have parallelism. But it also sounds...