Position and rotation should be interpolated such that the values calculated on the observing client are combined with the values transmitted by the authoritative client to produce a smoother simulation.
275ad8b173b5860a1e06524ff1395783bcbd34f9 includes interpolation of position, but rotation has not been interpolated yet and we will be switching to quaternions for buggy rotation.
Position and rotation should be interpolated such that the values calculated on the observing client are combined with the values transmitted by the authoritative client to produce a smoother simulation.