It's this patch:
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=e7eb1113f8a95e9927fdbe9cc6fb0ac101612be2#patch7
It should probably be mentioned in the incompatibilities section of the
9.0 release notes.
Addition will be included in my release notes patch, coming today.
--
-- Josh Berkus
PostgreSQL Experts Inc.
http://www.pgexperts.com
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