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d0f18cde7e
The docs claimed that \uhhhh would be interpreted as a Unicode value regardless of the database encoding, but it's never been implemented that way: \uhhhh and \xhhhh actually mean exactly the same thing, namely the character that pg_mb2wchar translates to 0xhhhh. Moreover we were falsely dismissive of the usefulness of Unicode code points above FFFF. Fix that. It's been like this for ages, so back-patch to all supported branches.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.