Some transformers,
like a "timeout" transformer, might make these operations depend on a
duration. Others might not delay them at all, or just by a microtask.</p>
<p>Transformers are free to handle errors in any way.
A transformer implementation may choose to propagate errors,
or convert them to other events, or ignore them completely,
but if errors are ignored, it should be documented explicitly.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</s