{B : Type u₁} →
  {inst : CategoryTheory.Bicategory B} →
    {C : Type u₂} →
      {inst_1 : CategoryTheory.Bicategory C} →
        {F G : CategoryTheory.OplaxFunctor B C} →
          {η : F ⟶ G} → [SizeOf B] → [SizeOf C] → CategoryTheory.Oplax.OplaxTrans.StrongCore η → ℕ