Bad value inserted into a TIME field on truncation

MariaDB [test]> drop table if exists t1; create table t1 (a time); insert into t1 values ('10:20:30'),('10:20:30+'),('2001-01-01 10:20:30'),('2001-01-01 10:20:30+'); show warnings; select * from t1;

Query OK, 0 rows affected (0.08 sec)

Query OK, 0 rows affected (0.36 sec)

Query OK, 4 rows affected, 3 warnings (0.08 sec)

Records: 4  Duplicates: 0  Warnings: 3

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

| Level   | Code | Message                                |

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

| Warning | 1265 | Data truncated for column 'a' at row 2 |

| Note    | 1265 | Data truncated for column 'a' at row 3 |

| Warning | 1265 | Data truncated for column 'a' at row 4 |

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

3 rows in set (0.00 sec)

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

| a        |

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

| 10:20:30 |

| 10:20:30 |

| 10:20:30 |

| 34:20:30 |

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

4 rows in set (0.00 sec)