on>

    <section class="desc markdown">
      <p>By default we store one message per channel.  There are tradeoffs associated
with any size.  The correct size should be chosen for the semantics of your
channel.</p>
<p>Size 0 implies you want to ignore any message that gets sent before the engine
is ready (keeping in mind there is no way to know when the engine is ready).</p>
<p>Size 1 implies that you only care about the most recent value.</p>
<p>Size &gt;1 means you want to process every single message an