Variable VRMHumanBoneParentMap`Const`

VRMHumanBoneParentMap: { [bone in VRMHumanBoneName]: VRMHumanBoneName | null }

An object that maps from VRMHumanBoneName to its parent VRMHumanBoneName.

Ref: https://github.com/vrm-c/vrm-specification/blob/master/specification/VRMC_vrm-1.0/humanoid.md