'blob:medium' => 'MEDIUMBLOB',

is missing in function db_type_map() in database.mysql-common.inc

And so is 'BIT'
for reference, quoted from the MySQL manual :

As of MySQL 5.0.3, a BIT data type is available for storing bit-field values. (Before 5.0.3, MySQL interprets BIT as TINYINT(1).) In MySQL 5.0.3, BIT is supported only for MyISAM. MySQL 5.0.5 extends BIT support to MEMORY, InnoDB, BDB, and NDBCLUSTER.

are these "by design"?

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