Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Instead of completely resetting a Villager's reputation for all players each time they are cured, we now only reset the relevant part of the reputation for only that player. This means the exploit is fixed and players cannot stack multiple cures until prices are down to 1, but doesn't have the same side effects that are commonly complained about with the current exploit fix.
