You could turn the signed 32-bit integer into a signed 64-bit integer, but this requires 4 bytes more per player in the player data. Sure, this might be a bit small-minded, but is it really necessary to have such a high-level number? This is hardly playable in Survival? A solution would be a BigInt which is then saved as a string in the world file. Unfortunately Java does not support unsigned integer, so you would have to write a wrapper around the integer to only cut the negative range.
You could turn the signed 32-bit integer into a signed 64-bit integer, but this requires 4 bytes more per player in the player data. Sure, this might be a bit small-minded, but is it really necessary to have such a high-level number? This is hardly playable in Survival? A solution would be a BigInt which is then saved as a string in the world file. Unfortunately Java does not support unsigned integer, so you would have to write a wrapper around the integer to only cut the negative range.