A bug in IntMap

Dear library folk, Christian posted a bug to Sourceforge concerning the IntMap library, function split. Can anyone shed any light? Better still, fix it? Simon and I have too many other bugs to nail for 6.4.1 thanks Simon http://sourceforge.net/tracker/index.php?func=detail&aid=1195579&group_i d=8032&atid=108032 "keys $ split 5 $ theMap" sometimes returns values greater 5. I am still trying to pinpoint the bug, but since it shows itself only deep inside a complicated structure, I have problems doing so. One pointer might be, that my values are partially evaluated functions, but this is only a guess. (Changing the data structure to Data.Map restores normal operation in my algorithm)