Why not use Result from core?

[YAMAMOTO Yuji]

Why is the type Combine.Result defined as

type Result res
  = Done res
  | Fail (List String)

instead of

type alias Result res = Result.Result (List String) res

using the Result.Result from the core even though they are obviously isomorphic?
It's annoying to convert every time calling parse!

[Bogdan Popa]

I'll make this change in the coming weeks. The reason I went with a new ADT initially is because I thought I would end up creating more result states that just those two.