title: Async.Parallel, grouping work of many works
body: <p>Is a pattern like:</p>
  
  <pre><code>seq[ workSeq, workSeq ..., workSeq, workSeq]
  |&gt; Seq.map( Async.Parallel )
  |&gt; Async.Parallel
  |&gt; Async.RunSynchronously
  </code></pre>
  
  <p>ok?, Or do i have to do: </p>
  
  <pre><code>seq[ workSeq, workSeq ..., workSeq, workSeq]
  |&gt; Seq.concat
  |&gt; Async.Parallel
  |&gt; Async.RunSynchronously
  </code></pre>
  
  <p>How do these two options behave differently ?</p>
  
  <p>Thanks</p>