∀ {F : Type u_2} {α : outParam (Type u_3)} [inst : FunLike F (Set α) ENNReal],
  (∀ (f : F), f ∅ = 0) →
    (∀ (f : F) {s t : Set α}, s ⊆ t → f s ≤ f t) →
      (∀ (f : F) (s : ℕ → Set α), Pairwise (Function.onFun Disjoint s) → f (⋃ i, s i) ≤ ∑' (i : ℕ), f (s i)) →
        MeasureTheory.OuterMeasureClass F α