unsupported lastimported(datetime) in schema

a la #866340: Remove support for date and time types, the lastimported column of type datetime is unsupported, which breaks migrate install with the following:
PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DEFAULT NULL COMMENT 'Date and time of last completed import', `highwater` VARC' at line 4: CREATE TABLE {migrate_status} ( `machine_name` VARCHAR(255) NOT NULL COMMENT 'Unique machine name for migration', `status` TINYINT unsigned NOT NULL DEFAULT 0 COMMENT 'Current status of migration', `lastimported` DEFAULT NULL COMMENT 'Date and time of last completed import', `highwater` VARCHAR(255) NOT NULL DEFAULT '' COMMENT 'Highwater mark for detecting updated content', `lastthroughput` INT DEFAULT NULL COMMENT 'Rate of success during most recent completed import (# per minute)', PRIMARY KEY (`machine_name`) ) ENGINE = InnoDB DEFAULT CHARACTER SET utf8 COMMENT 'Status information for migrations'; Array ( ) in db_create_table() (line 2561 of /d7/includes/database/database.inc).

Moshe you're on the comment thread so I'm sure you're aware of this, and it looks like there's discussion of rolling that patch back anyway. So whatever it's worth.