Ability to distinguish different NBT tags

[TheMightyMcGrew]

Being able to differentiate between items tagged with different nbt data would open a lot of doors for server owners. I.E. Im trying to make different player heads worth different amounts of currency, and if gunpowder respected NBT tags I could do just that, but because it only registers any given player head as minecraft:player_head it cannot, and we are limited to using player head as 1 form of currency