Ungrindable Items

With the update 1.14 the grindstone was added to the game. I like the feature to disenchant items and getting back a bit of xp. But I would suggest to add a special tag for items that shouldn't be grinded or disenchanted so that they can't be destroyed, especially custom items in adventure maps. The grinding process should be just blocked with the information "Ths item can't be grinded or combined in the grindstone"