Tectane's Trading Transformations

Introduction
Have you ever been disappointed by the items available in villager trading? Ever felt like the value of emeralds makes no economic sense? Ever made a trade by mistake, and wished you could convince them to accept returns?
This datapack aims to address those disappointments. It seamlessly overhauls villager trading, replacing the vanilla trading tables entirely. Items have a consistent price, a much wider variety is traded, and in most cases they can be both bought and sold. Now, you can mine diamonds and exchange them for cobblestone to build your castle. You can purchase weapons and armor, then sell the monster loot you get from using them. Trading is transformed from a fun but limited mechanic to a viable yet fair alternative to the grind that can make the late-game frustrating. Soon enough, you might regret playing with villagers any other way!

Features
- All villager professions have a modified and expanded trade possibilities at all levels. >280 different items are traded!
- Some villager professions renamed, villagers now show their profession name over their head.
- Coins! Ferrins (Iron Nuggets) and Aurins (Golden Nuggets) (with custom NBT) are now the only currency villagers will accept. They are uncraftable, so trading is the only way to acquire them. 1 Aurin is worth 8 Ferrins.
- Every item traded has a consistent price, but villagers will always pocket some change. (Gossip is no longer a factor, but Hero of the Village is!)
- Cartographer's explorer maps work as normal
- Enchanted armor/weapon/tool trades now require an unenchanted version of the item, but are otherwise unchanged.
- Librarian's enchanted books work as normal
- There are unique iron/chain weapons/armor/tools sold by the weaponsmith/toolsmith/armorer that steadily increase in enchantment level, up to just slightly better than netherite (with worse durability)
- Not a feature exactly, but: wandering traders use Aurins instead of emeralds.
- Nitwits (green robes) will purchase emeralds and give Aurins in exchange, making emeralds still useful to mine and loot.

Installation/Use
1. Download the pack and add it to the datapack folder.
2. Reopen the world you're in or run /reload.
3. It should be working from then! All villagers will automatically gain the new trades when they level up instead. Strongly recommended for new worlds, rather than old ones - vanilla emerald trades coexisting with the new ones is a recipe for exploitation.
If you'd like to give yourself any of the coins to play around with:
- /function traders:helper/give_aurin will give you an aurin
- /function traders:helper/give_ferrin will give you a ferrin
From there, using the 'pick block' key in the inventory in creative mode will let you create more.
(Note: this datapack uses the minecraft:load.json tag to run setup and begin the repeating schedule-loop. If you're using this pack with another, that conflict might need to be resolved!)

Disclaimer
- You may be worried, 'but this will break (in a balance sense) my game!'. And yeah, this is a work-in-progress, without the tremendous amount of tweaking and stress-testing necessary to be sure every number is perfect. If introduced into a tightly controlled, highly exploitative atmospheres; yeah it'll probably break the game. I can't be sure there's no way to dupe money (though I'd be very impressed if someone manages it) and several items become accessible before they otherwise would be, bypassing the planned progression. In several cases this is intentional - this is designed to give trading a major boost, and make it a viable alternative to elements of the game that players might rather avoid. A peaceful game now has access to monster loot like gunpowder and tridents, for instance. Shulker boxes, though extremely expensive, don't require battling through the End Islands, so players can use those features earlier. And large quantities of basic building materials like cobblestone, dirt, sand, dyes, blackstone, terracotta, etc. that are normally locked behind a few day's of grinding are now available to trade. Diamonds to castles, in Equivalent Exchange style. So, don't expect perfect balance. Don't expect the game's progression to be the same - in fact, expect the opposite. But I encourage you to give it a try, to judge for yourself the impact it has on your experience!
- This is my first time publishing something like this, so if I've missed anything obvious or done something wrong I apologize, and will do my best to address it quickly!

Finally
Thank you for reading this far! I really appreciate any comments, questions, bugs found, etc. Can't promise to be too active in responding as this is very much a side project, but I'll do my best. Have a lovely day!