use Business::Shipping::CustomMethodMaker
	new_with_init => 'new',
	new_hash_init => 'hash_init',
	boolean => [
		'update',
		'download',
		'unzip', 
		'convert',
		'is_from_west_coast',
	],
	hash => [ 'zone' ],
	grouped_fields_inherit => [
		optional => [ 
			'zone_file', 
			'zone_name',
		],
		required => [
			'from_state',
		],
	];