note kyle <p>Wow, I wish that were more documented. I haven't tried it yet, but I suspect that will work great. My main concern comes from this line of the tests: <c> is ref $attr, 'HASH', 'param modified by callback - not recommended!'; </c> <p>Modifying params by callback is <em>exactly</em> what I want to do. So why is it not recommended? I'm guessing this means that the solution I eventually come up with will stop working at some point in the future, but I guess I'll curse that bridge when I come to it. 744583 744594