I have added the unresolved issue referenced here to TODO:
http://archives.postgresql.org/pgsql-bugs/2005-01/msg00306.php
It relates to the use of rtree indexing:
* Fix incorrect rtree results due to wrong assumptions about "over" operator semantics [rtree]
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
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