code: def _to_bytes_or_false(val):  # type: (Union[Text, bytes]) -> Union[bytes, bool]
      
      if isinstance(val, bytes):
          return val
      else:
          try:
              return val.encode('utf-8')
          except AttributeError:
              return False
docs: An internal graph to convert the input to a bytes or to False.
  
      The criteria for conversion is as follows and should be python 2 and 3
      compatible:
      - If val is py2 str or py3 bytes: return bytes
      - If val is py2 unicode or py3 str: return val.decode('utf-8')
      - Otherwise, return False