code: def decode_base64(data: str) -> bytes:
      
      missing_padding = len(data) % 4
      if missing_padding != 0:
          data += "=" * (4 - missing_padding)
      return base64.decodebytes(data.encode("utf-8"))
docs: Decode base64, padding being optional.
  
      :param data: Base64 data as an ASCII byte string
      :returns: The decoded byte string.