fact: Definition setcategory_eq_idtoiso {C : setcategory} {x y : C} (p q : x = y) : pr1 (idtoiso p) = pr1 (idtoiso q).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors