title: Twisted AMP - how to send values bigger than 64K
body: <p>I'm using Twisted + AMP to communicate between a server and client, both of which are Python, fully under my control. My messages are usually short, but sometimes an argument can be longer than the 64K limit. Is there any way to handle this gracefully? </p>
  
  <p>I see that AMPv2 handles long messages, but I think that the Twisted implementation is for AMPv1.</p>
  
  <p>I suspect chunking will be part of the answer but I'm not sure how to do that. I only have one method that is susceptible to these long messages, so I don't need the most general solution. I am open to a making different <code>amp.Argument</code> subclass if it will help.</p>