code: func ByIDs(ids ...string) Filter {
  	var filters = make([]Filter, 0, len(ids))
  	for _, id := range ids {
  		id := id
  		filters = append(filters, func(a Artifact) bool {
  			return a.ExtraOr("ID", "") == id
  		})
  	}
  	return Or(filters...)
  }
docs: // ByIDs filter artifacts by an `ID` extra field.