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The point of this is not really to remove redundancy in pg_language.dat; with only three entries, it's hardly worth it. Rather, it is to get to a point where there are exactly zero hard-coded numeric pg_proc OID references in the catalog .dat files. The lanvalidator column was the only remaining location of such references, and it seems like a good thing for future-proofing reasons to make it not be a special case. There are still a few places in the .dat files with numeric OID references to other catalogs, but after review I don't see any that seem worth changing at present. In each case there are just too few entries to make it worth the trouble to create lookup infrastructure. This doesn't change the emitted postgres.bki file, so no catversion bump.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.