> It's sort of non-obvious that either behavior is better than the other.
Here's the reason why the existing behavior is wrong:
postgres=# select extract('epoch' from timestamptz 'infinity') = extract
('epoch' from timestamptz '1970-01-01 00:00:00-00');
?column?
----------
t
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com