The Meaning of Life, the Universe, and Everything.
I believe that the piglin should have optional nbt tags that define the specific item they will accept for bartering and a reference to the loot table they pick from when offering an item. Also, it would be nice if you could control the minimum and maximum lengths that they will be examining their item (or "pondering" the trade, as it is described on the minecraft wiki). This suggestion would not affect normal survival gameplay, but I think it would be useful to allow these behaviors of the piglin to be customizable for things like adventure maps and mods.
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Remember those versions that minecraft pranked us with? Specifically:
Those are still downloadable! Watch this video for 2.0:
To download the other ones you need to make a folder in the versions folder for minecraft and put the client and JSON file for the versions in there. They all need to be named the same aside from file extensions. Once you do that, you will be able to choose that version when making a new profile with the minecraft launcher.