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:
is ref $attr, 'HASH', 'param modified by callback - not recommended!';
Modifying params by callback is exactly 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.
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