code: public DeletionTime searchDeletionTime(Composite name)
      {
          int idx = searchInternal(name, 0);
          return idx < 0 ? null : new DeletionTime(markedAts[idx], delTimes[idx]);
      }
docs: Returns the DeletionTime for the tombstone overlapping {@code name} (there can't be more than one),
  or null if {@code name} is not covered by any tombstone.