Request for LocalPositionAdditiveX

[kyubuns]

The LocalPositionAdditive defined under PRIME_TWEEN_EXPERIMENTAL is extremely useful.
(As also noted in #212, I believe quite a few people are looking for this.)

First, why is this experimental?
Also, it would be very helpful to have LocalPositionAdditiveX, LocalPositionAdditiveY, etc., just like other similar features!

[KyryloKuzyk]

I'm sorry for the late reply. The additive tweens are currently experimental because they are not deterministic due to the floating-point rounding errors. #55 (comment)