code: def union(self, b):
          
  
          if not allow_dsis:
              return StridedInterval.least_upper_bound(self, b)
  
          else:
              if self.cardinality > discrete_strided_interval_set.DEFAULT_MAX_CARDINALITY_WITHOUT_COLLAPSING or \
                      b.cardinality > discrete_strided_interval_set.DEFAULT_MAX_CARDINALITY_WITHOUT_COLLAPSING:
                  return StridedInterval.least_upper_bound(self, b)
  
              else:
                  dsis = DiscreteStridedIntervalSet(bits=self._bits, si_set={ self })
                  return dsis.union(b)
docs: The union operation. It might return a DiscreteStridedIntervalSet to allow for better precision in analysis.
  
          :param b: Operand
          :return: A new DiscreteStridedIntervalSet, or a new StridedInterval.