code: def _is_missing_tags_strict(self):
          
          val = self.missing_tags
  
          if val == MissingTags.strict:
              return True
          elif val == MissingTags.ignore:
              return False
  
          raise Exception("Unsupported 'missing_tags' value: %s" % repr(val))
docs: Return whether missing_tags is set to strict.