fact: Definition join_nattrans_recdata {A B J : Type} (f : JoinRecData A B J) : NatTrans (opyon_0gpd J) (joinrecdata_0gpd_fun A B).
imports: Basics Types Cubical NullHomotopy Extensions Colimits.Pushout Truncations.Core Truncations.Connectedness Pointed.Core WildCat Spaces.Nat.Core