∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {_P : CategoryTheory.MorphismProperty C}
  [inst_1 : _P.IsMultiplicative] [inst_2 : SizeOf C] [inst_3 : ⦃X Y : C⦄ → (x : X ⟶ Y) → SizeOf (_P x)] (obj : C),
  sizeOf { obj := obj } = 1 + sizeOf obj