foldrDiff visit seed a b =
  T.foldrDiffVersioned cellVersionsEqual compare (visitor visit) seed
  (run a) (run b)
foldrDiff visit seed a b =
  T.foldrDiffVersioned cellVersionsEqual compare (visitor visit) seed
  (run a) (run b)
foldrDiff visit seed a b =
  T.foldrDiffVersioned cellVersionsEqual compare (visitor visit) seed
  (run a) (run b)