Provide a warning that enum is not supported when generating schema for a table

I am making a module, and created a MySQL table with a field of type ENUM. I then went to admin/build/schema/inspect and copied the generated schema for my table, which included this:

  $schema['cscontent_destinations'] = array(
  'description' => t('Information about content destinations for cscontent module.'),
  'fields' => array(
    'type' => array(
      'description' => t('What kind of destination is this going to?'),
      'type' => 'enum',
      'not null' => TRUE,
    ),
);

You can see the 'type' => 'enum', which is not supported by the core scheme API. This should probably default to an int, or give a warning that enum is not supported by core.