   end
 
   @doc """
-  The identity function lifted into an arrow of the correct type
+  The identity function lifted into an arrow of the correct type.
 
   ## Examples
 

  end

  @doc """
  Target the second element of a tuple

  ## Examples


  def swap({x, y}), do: {y, x}

  @doc """
  Target the first element of a tuple.

  ## Examples

