docs: def _get_boolean(data, position, dummy0, dummy1, dummy2):
      """Decode a BSON true/false to python True/False."""
      end = position + 1
      boolean_byte = data[position:end]
      if boolean_byte == b'\x00':
          return False, end
      elif boolean_byte == b'\x01':
          return True, end
      raise InvalidBSON('invalid boolean value: %r' % boolean_byte)