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. I guess such entries are never hit (as they contain timestamps, which are often unique for unregistered users) and since of the long expiration date they fill the cache -- in a couple of weeks it grew to 690MB. What's the best way to circumvent this problem?