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On Wed, Jul 03, 2013 at 08:53:21AM -0300, Roberto Ierusalimschy wrote:
> > 1. Any solution that addresses only arrays does not solve the problem
> >    identified by the OP.
> What is "OP"?

Original Poster.

Incidentally, my solution to an "empty" value is empty = {}, and then
use if == empty then...