docs: @Override
    long[] getCache() {
      final int curCount = getRetainedEntries(true);
      if (curCount > 0) {
        final long[] cache = new long[curCount];
        final int preLongs = getCurrentPreambleLongs(true);
        mem_.getLongArray(preLongs << 3, cache, 0, curCount);
        return cache;
      }
      return new long[0];
    }