mer-class.html">StreamTransformer</a> should document clearly how it transforms the
stream (on the class or variable used to access the transformer),
as well as any differences from the following typical behavior:</p>
<ul>
<li>When the returned stream is listened to, it starts listening to the
input <code>stream</code>.</li>
<li>Subscriptions of the returned stream forward (in a reasonable time)
a <a href="../../dart-async/StreamSubscription/pause.html">StreamSubscription.pause</a> call to the subscription 