code: def join(self, *data: Iterable[MaybeBytes]) -> bytes:
          
          return self.how.join([bytes(item) for item in chain(*data)])
docs: Iterable join on a delimiter.
  
          Args:
              data: Iterable of items to join.
  
          Examples:
              ::
  
                  BytesFormat(b' ').join([b'one', b'two', b'three'])