docs: def merge(self, other):
          """
          Combine this region with other.
          """
          if not isinstance(other, one):
              other = one(other)
          new = concatenate((self.coordinates, other.coordinates))
          unique = set([tuple(x) for x in new.tolist()])
          final = asarray([list(x) for x in unique])
          return one(final)