LIMIT clause allows not only integer values while creating system versioned table

MariaDB [test]> create table t1 (i int) with system versioning   partition by system_time limit 11.999999 (partition p0 history, partition pn current);

Query OK, 0 rows affected (0.103 sec)

MariaDB [test]> show create table t1;

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

| Table | Create Table                                                                                                                                                                                                                      |

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

| t1    | CREATE TABLE `t1` (

  `i` int(11) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=latin1 WITH SYSTEM VERSIONING

 PARTITION BY SYSTEM_TIME LIMIT 11

(PARTITION `p0` HISTORY ENGINE = InnoDB,

 PARTITION `pn` CURRENT ENGINE = InnoDB) |

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

1 row in set (0.006 sec)

MariaDB [test]> create or replace table t1 (i int) with system versioning   partition by system_time INTERVAL 1.4 WEEK;

Query OK, 0 rows affected (0.105 sec)

MariaDB [test]> show create table t1;

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

| Table | Create Table                                                                                                                                                                                             |

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

| t1    | CREATE TABLE `t1` (

  `i` int(11) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=latin1 WITH SYSTEM VERSIONING

 PARTITION BY SYSTEM_TIME INTERVAL 7 DAY STARTS TIMESTAMP'2020-09-21 00:00:00'

PARTITIONS 2 |

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

1 row in set (0.002 sec)