Port to 1.21.4 Includes a mostly untested math expression evaluator and an unimaginably hacky solution to something that shouldn't be a problem to begin with.
port to fabric 1.21.1
additions/changes to the MutablePartPose class
changed the clusterfuck of "uninverted" and "extract_root" json members to an "equation" easing type, incredibly fragile and is almost guaranteed to hard-freeze your game if you mess something up. also some questionable choices/changes to the overall arm-posing-model API.
Update to 1.21
