The latest version of libpq type system is available here:
http://www.esilo.com/projects/postgresql/libpq/typesys-0.9a.tar.gz
The following modifications where made:
*) documentation fixes
*) parameter resets are no longer automatic
*) updated to patch vs. REL8_3_STABLE
Merlin Moncure & Andrew Chernow
eSilo