docs: def encode_dict(dynamizer, value):
      """ Encode a dict for the DynamoDB format """
      encoded_dict = {}
      for k, v in six.iteritems(value):
          encoded_type, encoded_value = dynamizer.raw_encode(v)
          encoded_dict[k] = {
              encoded_type: encoded_value,
          }
      return 'M', encoded_dict