fact: Definition inv2cell_to_z_iso_weq {a b : B} (f g : hom a b) : invertible_2cell f g ≃ z_iso f g.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.Bicategories.Core.Bicat