∀ {α : Type u_1} {β : Type u_2} (z : Lean.PersistentHashMap.Zipper α β) (keys : Array α) (vals : Array β)
  (hsz : keys.size = vals.size),
  Lean.PersistentHashMap.Zipper.prependNode (Lean.PersistentHashMap.Node.collision keys vals hsz) z =
    Lean.PersistentHashMap.Zipper.consCollision (Std.Rii.Sliceable.mkSlice keys *...*)
      (Std.Rii.Sliceable.mkSlice vals *...*) ⋯ z