[Zope] ZCatalog and random key error

hello all i'm about to venture into building a ZClass that will make use of ZCatalog. is it 'safe' now? i see that my zope2.2.2 now haven't encountered any random key error yet. what about others? also, will iterating through catalog index faster than iterating through ..say.. objectItems('meta-type')? looking for insight, advice, holes to avoid, etc thanks -- http://www.kedai.com.my/kk http://www.kedai.com.my/eZine use Zope? then you got HOPE!