Small bug in webform_validation_schema()

After installing webform_validation module I got the following error in the database schema comparison report (admin/build/schema/compare):

column ruleid - difference on: not null
declared: array('description' => t('TODO: please describe this field!'), 'type' => 'serial', 'unsigned' => TRUE)
actual: array('description' => t('TODO: please describe this field!'), 'type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE)

The error disappears if I add
'not null' => TRUE,
to the ruleid array of the webform_validation_schema() in webform_validation.install.