docs: @Override
    long[] getCache() {
      if (mem_ == null) {
        return (hashTable_ != null) ? hashTable_ : new long[0];
      }
      //Direct
      final int arrLongs = 1 << lgArrLongs_;
      final long[] outArr = new long[arrLongs];
      mem_.getLongArray(CONST_PREAMBLE_LONGS << 3, outArr, 0, arrLongs);
      return outArr;
    }