Wow! Thanks Stéphane... that was a little piece of magic I was<br>hoping for. It&#39;s a bit verbose, but at least it doesn&#39;t affect<br>performance and it allows all the control over types I need.<br><br>I now see I didn&#39;t really grok phantom types whenever they were<br>
mentioned. A bit of &quot;in one ear and out the other&quot;. Now I have<br>better grasp on yet another feature of the language.<br><br><br>I know I read that one before, Dario... that title about NASA<br>is familiar! Too bad I didn&#39;t remember it was a solution to the<br>
problem I was now having. Thank-you for that link -- an<br>excellent description of the problem and a nice solution.<br><br><br>Ah, great stuff... that looks like something to consider too,<br>Sylvain! There&#39;s plenty of material on phantom types but I never<br>
made the connection that they were what I was looking for.<br><br><br>Thank-you everyone for the help and clear explanations! I&#39;m<br>going to go play with this now. :)<br><br>Anthony Tavener<br><br>