Why is unsigned int so rare in haskell? [duplicate]

Question

Generally Haskell libraries make a point of making impossible states unrepresentable in the types. But I often see Int used where only a non-negative number makes sense. Why is Word not used in those cases?

Answer 1

We only just now got Numeric.Natural in base, too.

I think it is just historical accident. Int and Integer were in the haskell 98 prelude, which didn't get bogged down with lots of other fixed-size integer types.