code: def _ior(self, other):
  		
  		# TODO do we have to create a bag from the other first?
  		if not isinstance(other, _basebag):
  			other = self._from_iterable(other)
  		for elem, other_count in other.counts():
  			old_count = self.count(elem)
  			new_count = max(other_count, old_count)
  			self._set_count(elem, new_count)
  		return self
docs: Set multiplicity of each element to the maximum of the two collections.
  
  		if isinstance(other, _basebag):
  			This runs in O(other.num_unique_elements())
  		else:
  			This runs in O(len(other))