equality operation on cast of the value "-0.0" to decimal not working

> create table test (a varchar(255));

Query OK, 0 rows affected (0.02 sec)

> insert into test values ('-0.0');

Query OK, 1 row affected (0.00 sec)

> select * from test where cast(a as decimal(5,1)) < 0;

+------+

| a    |

+------+

| -0.0 |

+------+

1 row in set (0.00 sec)

> select * from test where cast(a as decimal(5,1)) > 0;

Empty set (0.00 sec)

> select @@version;

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

| @@version       |

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

| 10.1.14-MariaDB |

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

1 row in set (0.00 sec)