table "profiles" has ids, and for them type "id" should be used. several entries that are ids use integers and even strings.
if multiple ids have to be stored for some key, that key is used multiple times, multiple ids are not stuffed in it.
currently known cases :
web.avail_report.0.groupid - integer
web.avail_report.1.groupid - integer
web.dashconf.groups.groupids - integer
web.items.filter_groupid - string
web.avail_report.0.hostid - integer
web.avail_report.1.hostid - integer