private function removeRoleForUserByColumnValue($columnName, $columnValue, $role) {
		$role = (int) $role;

		return $this->modifyRolesForUserByColumnValue(
			$columnName,
			$columnValue,
			function ($oldRolesBitmask) use ($role) {
				return $oldRolesBitmask & ~$role;
			}
		);
	}