title: Elixir: what is the binary printed in the repl after module definition?
body: <p>I wrote a simple module in the repl:</p>
  
  <pre><code>iex(26)&gt; defmodule Adder do
  ...(26)&gt; def add(a \\ 0, b \\ 0) do
  ...(26)&gt; a+b
  ...(26)&gt; end
  ...(26)&gt; end
  {:module, Adder,
   &lt;&lt;70, 79, 82, 49, 0, 0, 4, 224, 66, 69, 65, 77, 65, 116, 111, 109, 0, 0, 0, 106, 0, 0, 0, 12, 12, 69, 108, 105, 120, 105, 114, 46, 65, 100, 100, 101, 114, 8, 95, 95, 105, 110, 102, 111, 95, 95, 4, 100, 111, 99, ...&gt;&gt;,
   {:add, 2}}
  </code></pre>
  
  <p>What is the binary printed out after the module definition?</p>