http://ffdev4.net/index.php?main_pag...&products_id=4
85
I have two in stock in size 80, and one in size 86. As you will see, you can
buy 2, and even 3, in size 86 (which should show out of stock at 2), but
when you add the 4th, it finally shows out of stock.

Every single product that has more than one (which is pretty much the whole
site minus just a few) is calculating stock this way.

Show available stock in cart when less than order is set to true (I think
that was the setting you were referring to?)