<li><code>len</code> - the length of each message when split using a fixed length value</li>
        </ul>
        </dd>
    </dl>
    <h3>Details</h3>
    <p>This node makes it easy to create a flow that performs common actions across
    a sequence of messages before, using the <b>join</b> node, recombining the
    sequence into a single message.</p>
    <p>It uses the <code>msg.parts</code> property to track the individual parts
    of a sequence.</p>
    <h4>Streaming mode</h4>
    <p>The node can also 