docs: def duplicate(self, contributor=None):
          """Duplicate (make a copy) ``Data`` objects.
  
          :param contributor: Duplication user
          """
          bundle = [
              {'original': data, 'copy': data.duplicate(contributor=contributor)}
              for data in self
          ]
  
          bundle = rewire_inputs(bundle)
          duplicated = [item['copy'] for item in bundle]
  
          return duplicated