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16e985b47d
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.