What happened to the is_<type> family of functions proposal?

Hi,

Back in 2002 these were proposed, what happened to them?

http://archives.postgresql.org/pgsql-sql/2002-09/msg00406.php

Also I note:

colin(at)ruby:~/workspace/eyedb$ psql
psql (8.4.4)
Type "help" for help.

colin=> select to_date('731332', 'YYMMDD');
to_date
------------
1974-02-01
(1 row)

colin=>

The fact that this wraps would seem to me to make the implementation of
is_date() difficult.

I'm trying to query character strings for valid dates but can't see how to
do this quickly... but for that discussion I will move to pgsql-general :-)

Cheers,

Colin