What happened to the is_ family of functions proposal?

Hi,<br /><br />Back in 2002 these were proposed, what happened to them?<br /><br /><a
href="http://archives.postgresql.org/pgsql-sql/2002-09/msg00406.php">http://archives.postgresql.org/pgsql-sql/2002-09/msg00406.php</a><br
/><br/><br /> Also I note:<br /><br />colin@ruby:~/workspace/eyedb$ psql<br />psql (8.4.4)<br />Type "help" for
help.<br/><br />colin=> select to_date('731332', 'YYMMDD');<br />  to_date   <br />------------<br /> 1974-02-01<br
/>(1 row)<br /><br />colin=> <br /><br /><br />The fact that this wraps would seem to me to make the implementation
ofis_date() difficult.<br /><br /><br />I'm trying to query character strings for valid dates but can't see how to do
thisquickly... but for that discussion I will move to pgsql-general :-)<br /><br />Cheers,<br /><br />Colin<br />