Thread:Talk:ResourceLoader/Cache consumption

Hi, sorry if this is a wrong place to ask ... in our install of Mediawiki 1.19 (http://wiki.geogebra.org/en/Special:Version ) the ResourceLoader stores some Javascript which contains timestamps: in the cache (objectcache table in MySQL) with expiration date 2038. The guess such entries are never hit (as they contain timestamps, which are often unique for unregistered users) and since of the long expiration date the fill the cache -- in a couple of weeks it grew to 690MB. What's the best way to circumvent this problem?