∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] {D : Type u_2}
  [inst_1 : CategoryTheory.Category.{v_2, u_2} D] (e : C ≌ D),
  e.inverseFunctorObjIso.hom = CategoryTheory.CategoryStruct.id (Opposite.op e.inverse)