pg_temp implicit search path: functions vs. tables

Hi all,

I notice slightly different handling of the implicit search_path for
temporary tables and temporary functions. Consider:

(with a default search path):

# SHOW search_path;
  search_path
----------------
 "$user",public
(1 row)


BEGIN;
  CREATE TABLE pg_temp.bar();

  CREATE FUNCTION pg_temp.foofunc() RETURNS int AS $$
      SELECT 1;
  $$ LANGUAGE SQL;

  SELECT * FROM bar;
  SELECT * FROM foofunc();

COMMIT;

The select from temporary table bar above succeeds, but I get:
ERROR:  function foofunc() does not exist

if I don't schema-qualify the function as pg_temp.foofunc(). So,
pg_temp is being implicitly included in the default search path when
looking for tables, but not for functions. Is there a reason for this
difference?

Josh