cakephp habtm and validator array structure

habtm_structure

Array
	(
	[Post] => Array
		(
			[name] => my test post
		)
	[Tag] => Array
		(
		[Tag] => Array
			(
				[0] => 1
				[1] => 3
			)
		)
	)

validator_structure

Array
	(
	[Post] => Array
		(
			[name] => my other test post
			[Tag] => Array
				(
				[0] => 2
				[1] => 4
			)
		)
	)