public function UserCacheRoles($UserID, $RoleIDs) {
      if (is_null($UserID) || !$UserID) return FALSE;
      
      $Cached = TRUE;
      
      $UserRolesKey = FormatString(self::USERROLES_KEY, array('UserID' => $UserID));
      $Cached = $Cached & Gdn::Cache()->Store($UserRolesKey, $RoleIDs);
      return $Cached;
   }