a bug of set()

here I use

PHP Code:

$db->table('user')->set('item_num','item_num+1',false)->where('id',1)->update(); 


the value of item_num in mysql become "0"

it Executes: (please note red part)

UPDATE `lb_user` SET item_num = 'item_num+1' WHERE `id` = '1'


but when I use the follow code
UPDATE `lb_user` SET item_num = item_num+1 WHERE `id` = '1'

it works well.

I guess the third param($escape) might be a bug. please test, thanks.

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