docs: def _get_slicers(self, index):
          """Return a slice object to slice a list/bytearray by.
  
          Positional arguments:
          index -- index of self.SIGNATURE to target self.bytearray by.
  
          Returns:
          slice() object. E.g. `x = _get_slicers(0); ba_instance[x]`
          """
          if not index:  # first item.
              return slice(0, self.SIGNATURE[0])
          if index >= len(self.SIGNATURE):
              raise IndexError('index out of self.SIGNATURE range')
          pad_start = sum(self.SIGNATURE[:index])
          pad_stop = pad_start + self.SIGNATURE[index]
          return slice(pad_start, pad_stop)