s this all mean in practice?</p><ul>
<li>You may design your protocol however you want, except the following requirement: Define a <em>handle-containing message</em> as a combination of a blob of 1+ bytes of some known (on both sides, at the time of both sending and receipt) length N <em>and</em> exactly <em>one</em> handle. You must aim to send this message and receive it exactly as sent, meaning with message boundaries respected. (To be clear, you're free to use any technique to make N known on both sides