docs: @Pure
  	public static SpaceUnit getSmallestUnit(double amount, SpaceUnit unit) {
  		final double meters = toMeters(amount, unit);
  		double v;
  		final SpaceUnit[] units = SpaceUnit.values();
  		SpaceUnit u;
  		for (int i = units.length - 1; i >= 0; --i) {
  			u = units[i];
  			v = Math.floor(fromMeters(meters, u));
  			if (v > 0.) {
  				return u;
  			}
  		}
  		return unit;
  	}