docs: public static final int getMaxUpdatableSerializationBytes(final int lgConfigK,
        final TgtHllType tgtHllType) {
      final int arrBytes;
      if (tgtHllType == TgtHllType.HLL_4) {
        final int auxBytes = 4 << LG_AUX_ARR_INTS[lgConfigK];
        arrBytes =  AbstractHllArray.hll4ArrBytes(lgConfigK) + auxBytes;
      }
      else if (tgtHllType == TgtHllType.HLL_6) {
        arrBytes = AbstractHllArray.hll6ArrBytes(lgConfigK);
      }
      else { //HLL_8
        arrBytes = AbstractHllArray.hll8ArrBytes(lgConfigK);
      }
      return HLL_BYTE_ARR_START + arrBytes;
    }