code: def read(self, entity=None, attrs=None, ignore=None, params=None):
          
          if attrs is None:
              attrs = self.read_json()
          attrs['override'] = attrs.pop('override?')
          attrs['unlimited'] = attrs.pop('unlimited?')
          return super(Filter, self).read(entity, attrs, ignore, params)
docs: Deal with different named data returned from the server