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:dynamic slots

I agree, and would like to amplify the important point you made: it
isn't necessary to define a new metaclass to get the essential
functionality of the :dynamic feature.  You can do it with a class that
gets inherited by anybody using the feature, plus a macro.  We've been
doing the equivalent thing with flavors for a long time, using a flavor
called property-list-mixin.  The only advantage to building in :dynamic
that I can see would be if you like that syntax better.  I don't see any
reason to expect a performance penalty.