esses
 each element with another coroutine step, and collects the resulting
 values into a target collection. If invoked asynchronously each iteration
 will be invoked as a separate suspension, but values are still processed
 sequentially. After the iteration has completed the coroutine continues
 with the next step with the collected values as it's input.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fCollectionFactory</code> - A supplier that returns a collection of the