Alternatively, you could consider having `Positions` store an `iter::Enumerate<I>` instead of `I`+`usize`.

[hellow554]

Alternatively, you could consider having Positions store an iter::Enumerate<I> instead of I+usize.

(But if you want to go that way, it's probably better as a separate PR, since it would change lots of places.)

Originally posted by @scottmcm in #618 (comment)

[hellow554]

Ups, I wanted to have that in my fork of this repo. But now it's here. :)

I'm gonna work on that, give me a week or two.