Hey,
This update fixes a bug with some shop plugins (notably ShopChest) that are able to create a shop based on an in-game item. Now, it should be possible to have restrict-obtaining on while using these in-game items with the shop!

Thank you @ DalekLIVE for assisting with the bug reports.

Technical Details:
The way these shop plugins store itemstacks involve serializing the object. For some reason, Bukkit serializes NBT tags that have strings with "true" into a byte as 1. In order to mitigate this and compress the NBT tag that ProtectionStones uses, I've switched the default recognized NBT tag to be a byte rather than a string.