Dave Mason writes:
 > Very cute!  But not threadsafe among threads that use the same set of
 > attributes (unless I missed something).  I point this out simply as a
 > warning, not because I think it invalidates the (neat) trick.

That's easy to fix, and while you're about it you may as well extend
the idea to implement object-orientation a la Perl---only type-safe :).
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