ReadonlyinverseOne column-major inverse bind matrix per joint (16 floats each, finite),
or null for the identity default. glTF's bone-axis convention is
absorbed here (RFC 0003): no conversion is applied, none is needed.
ReadonlyjointsJoint node indices, in file order — the joint index is the position.
ReadonlynameThe skin's authored name, or "".
One glTF skin, as data — bones are assembled at instantiation.