Using default value for bigint fields generates an error

A field defined as:
'user_id' => array(
   'type' => 'bigint',
   'length' => 22,
   'default' => 0,
),

Generates an error when create-tables is used:
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 ' [...] user_id bigint(22) DEFAULT , INDEX schedule_prize_id_idx (schedule_prize_id)[..]

The default value is not accounted for.