private ExtraChecksInfo collectExtraDebugInfo() {
      if (!EXTRA_CONSISTENCY_CHECKS) {
        return null;
      }
      int[] maxAllocatedId = new int[]{0};
      try {
        myForwardIndex.processEntries((inputId, data) -> {
          if (maxAllocatedId[0] < inputId) maxAllocatedId[0] = inputId;
        });
      }
      catch (StorageException e) {
        LOG.error("MappedFileTypeIndex extra check init fail", e);
      }
      var invertedIndexInitKeys = new ArrayList<>(myInvertedIndex.keySet());
      invertedIndexInitKeys.sort(Comparator.naturalOrder());
      var invertedIndexInitKeysRanges = new ArrayList<IntRange>();
      var lastRangeStart = -1;
      var lastRangeEnd = -1;
      for (int key : invertedIndexInitKeys) {
        if (lastRangeStart == -1) {
          lastRangeStart = key;
          lastRangeEnd = key;
        }
        else if (lastRangeEnd == key - 1) {
          lastRangeEnd = key;
        }
        else {
          invertedIndexInitKeysRanges.add(new IntRange(lastRangeStart, lastRangeEnd));
          lastRangeStart = key;
          lastRangeEnd = key;
        }
      }
      if (lastRangeStart != -1) {
        invertedIndexInitKeysRanges.add(new IntRange(lastRangeStart, lastRangeEnd));
      }
      return new ExtraChecksInfo(maxAllocatedId[0], invertedIndexInitKeysRanges);
    }
private ExtraChecksInfo collectExtraDebugInfo()