docs: public static double convertLength(@FloatRange(from = 0) double distance,
                                       @NonNull @TurfUnitCriteria String originalUnit,
                                       @Nullable @TurfUnitCriteria String finalUnit) {
      if (finalUnit == null) {
        finalUnit = TurfConstants.UNIT_DEFAULT;
      }
      return radiansToLength(lengthToRadians(distance, originalUnit), finalUnit);
    }