Comparison result for column w/ YEAR(4) and const w/ 2 digits is incorrect

mysql> drop table t1; create table t1(a year(4));

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

mysql> insert into t1 values (1930);

Query OK, 1 row affected (0.00 sec)

mysql> select a, a < 10 from t1;

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

| a    | a < 10 |

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

| 1930 |      1 |

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

1 row in set (0.00 sec)

mysql> select version();

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

| version()           |

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

| 10.1.10-MariaDB-log |

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

1 row in set (0.00 sec)

drop table t1; create table t1(a year(4));

insert into t1 values (1930);

select a, a < 10 from t1;