Joel VanderWerf wrote:

 > I'd vote against it because of the performance cost of checking each
 > attr assignment for a hook.

I see. But performance is not always the top priority, and users make 
the choice which constructs to use.

 > If I needed to do something like this, I'd
 > use an AOP approach to intercepting the attr writer.

I would be very glad if you could provide an example :)

Tobi
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