#009295: Problem with fetch parameter "user_id" for collected informations

Considering the online documentation on collected informations (http://svn.ez.no/filedetails.php?repname=ezpublish&path=%2Ftrunk%2Fdoc%2Ffeatures%2F3.8%2Finfocollector_fetchfunctions.txt&rev=0&sc=0), I have a problem with the hash parameter 'user_id' of function "collected_info_list" and "collected_info_count" . Indeed, this parameter is inactive for me and when I made a query with user_id, I have always a response with collected informations of my object for all user (even if I try a user id that don't exist).

Operating System:
PHP Version: PHP 4.3.10
Database and version: MySQL 4.1.9

Example of a query I made:
{def $resultList = fetch( 'content', 'collected_info_list',
hash( 'object_id', $object.contentobject_id, 'user_id', 666 )
)}