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http://archives.postgresql.org/pgsql-hackers/2004-10/msg00464.php. This fix is intended to be permanent: it moves the responsibility for calling SetBufferCommitInfoNeedsSave() into the tqual.c routines, eliminating the requirement for callers to test whether t_infomask changed. Also, tighten validity checking on buffer IDs in bufmgr.c --- several routines were paranoid about out-of-range shared buffer numbers but not about out-of-range local ones, which seems a tad pointless.