Exporting a spine file to json used to give a deterministic result (only changing the hash). Since 3.8, each time a Skeleton is exported, the json (maybe only the attachments
part of skins?) is in random order. It would be nice if they were sorted alphabetically.
We look on the diff of json files to determine what was changed in a spine file. If it was a simple change in spine, seeing what changed through the json was simple when the json was deterministically generated.