code: def peek(self, j=(0, 1)):
          
          try:
              if isinstance(j, int):
                  return self[self.__i+j]
              return self[self.__i + j[0]:self.__i + j[1]]
          except IndexError:
              return None
docs: Peek at the next value(s), without advancing the Buffer.
          Return None if index is out of range.