has default_value => ( is => 'rw' );
-=head2 extra
-
-Get or set the field's "extra" attributes (e.g., "ZEROFILL" for MySQL).
-Accepts a hash(ref) of name/value pairs to store; returns a hash.
-
- $field->extra( qualifier => 'ZEROFILL' );
- my %extra = $field->extra;
-
-=cut
-
=head2 foreign_key_reference
Get or set the field's foreign key reference;