∀ {m : Type u_1 → Type u_2} {α : Type u_3} {β : Type u_1} {n : ℕ} [inst : Monad m] [LawfulMonad m] {f : α → m β}
  {xs : Vector α n} (_x : (i : ℕ) ×' (_ : i ≤ n) ×' Vector β i),
  Vector.toArray <$> Vector.mapM.go✝ f xs _x.1 ⋯ _x.2.2 = Array.mapM.map✝ f xs.toArray _x.1 _x.2.2.toArray