Kurt Roeckx <kurt@roeckx.be> writes:
> 8.2 and 8.3 actually get the same value in fmgr_oldstyle(), it just
> seems they do something else with it somewhere else.
Doh. I'll bet the difference is this fix:
http://archives.postgresql.org/pgsql-committers/2007-07/msg00131.php
Please try that patch and see what it fixes pre-8.3.
regards, tom lane