   end
 
   @doc """
-  Send a YIELD message from `peer` for `invocation`.
+  Send a `YIELD` message from `peer` for `invocation`.
   """
   def cast_yield(peer, invocation, options \\ []) do
     {:ok, yield} = new_yield_message(invocation, options)

  end

  @doc """
  Receive a REGISTERED message from `peer` with `register_id`.
  """
  def receive_registered(peer, register_id) do
    receive do

  end

  @doc """
  Receive an `UNREGISTERED` message from `peer` with `unregister_id`.
  """
  def receive_unregistered(peer, unregister_id) do
    receive do
