max_binlog_total_size and slave_connections_needed_for_purge require wrong permissions

MariaDB [(none)]> show grants for current_user();

+------------------------------------------------------+

| Grants for binlogger@localhost                       |

+------------------------------------------------------+

| GRANT BINLOG ADMIN ON *.* TO `binlogger`@`localhost` |

+------------------------------------------------------+

1 row in set (0.000 sec)

MariaDB [(none)]> set global max_binlog_size= 1024*1024;

Query OK, 0 rows affected (0.000 sec)

MariaDB [(none)]> set global max_binlog_total_size= 1024*1024;

ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER privilege(s) for this operation

MariaDB [(none)]> set global slave_connections_needed_for_purge= 0;

ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER privilege(s) for this operation

MariaDB [(none)]> show grants for current_user();

+----------------------------------------------+

| Grants for superman@localhost                |

+----------------------------------------------+

| GRANT SUPER ON *.* TO `superman`@`localhost` |

+----------------------------------------------+

1 row in set (0.000 sec)

MariaDB [(none)]> set global max_binlog_size= 1024*1024;

ERROR 1227 (42000): Access denied; you need (at least one of) the BINLOG ADMIN privilege(s) for this operation

MariaDB [(none)]> set global max_binlog_total_size= 1024*1024;

Query OK, 0 rows affected (0.000 sec)

MariaDB [(none)]> set global slave_connections_needed_for_purge= 0;

Query OK, 0 rows affected (0.000 sec)