   ## Examples
 
       defmodule MyModule do
-        Module.register_attribute __MODULE__,
-          :custom_threshold_for_lib,
-          accumulate: true, persist: false
+        Module.register_attribute(__MODULE__, :custom_threshold_for_lib, accumulate: true)
 
         @custom_threshold_for_lib 10
         @custom_threshold_for_lib 20


      defmodule Foo do
        contents = quote do: (def sum(a, b), do: a + b)
        Module.eval_quoted __ENV__, contents
      end

      Foo.sum(1, 2) #=> 3

  ## Examples

      defmodule MyModule do
        Module.put_attribute(__MODULE__, :custom_threshold_for_lib, 10)
        Module.delete_attribute(__MODULE__, :custom_threshold_for_lib)
      end

  """
