sk89q/worldguard — pull request #277 by ampayne2 (2013-07-12 23:30:19+00:00)
Title: Item Blacklist for /stack

Added an Item Blacklist for the /stack command
/stack will basically not stack anything blacklisted.
Created so players on servers (such as donators) have access to the usefulness of /stack, without ruining certain aspects of the game.
One example is potions on PvP servers. With stacked potions, players would have a significant advantage.