code: public boolean isAdjacent(Marker other)
      {
          checkTypeCompatibility(other);
          if (isUpperUnbounded() || isLowerUnbounded() || other.isUpperUnbounded() || other.isLowerUnbounded()) {
              return false;
          }
          if (type.compareTo(valueBlock.get(), 0, other.valueBlock.get(), 0) != 0) {
              return false;
          }
          return (bound == Bound.EXACTLY && other.bound != Bound.EXACTLY) ||
                  (bound != Bound.EXACTLY && other.bound == Bound.EXACTLY);
      }
docs: Adjacency is defined by two Markers being infinitesimally close to each other.
  This means they must share the same value and have adjacent Bounds.