docs: int findDelete(
      int              lower,
      int              upper,
      Object           delKey)
    {
      int nkeys = numKeys(lower, upper);
      int idx = -1;
      if (nkeys < 4)
        idx = sequentialFindDelete(lower, upper, delKey);
      else
        idx = binaryFindDelete(lower, upper, delKey);
      return idx;
    }