Bad values in metadata views for partitions on VARBINARY

CREATE OR REPLACE TABLE t1 (a VARBINARY(10)) CHARACTER SET utf8

  PARTITION BY LIST COLUMNS (a) (PARTITION p0 VALUES IN (0xFF));

SHOW CREATE TABLE t1;

SELECT PARTITION_DESCRIPTION FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_NAME='t1';

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

| Table | Create Table                                                                                                                                                                |

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

| t1    | CREATE TABLE `t1` (

  `a` varbinary(10) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8

 PARTITION BY LIST  COLUMNS(`a`)

(PARTITION `p0` VALUES IN ('�') ENGINE = InnoDB)  |

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

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

| PARTITION_DESCRIPTION |

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

| '?'                   |

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