code: @SuppressWarnings("ObjectEquality")
      public int compareTo(int offset, int length, Slice that, int otherOffset, int otherLength)
      {
          return compareTo(offset, length, that.base, otherOffset, otherLength);
      }
docs: Compares a portion of this slice with a portion of the specified slice.  Equality is
  solely based on the contents of the slice.