is 0xff (255), all the bytes of the field (including the leading byte)
are concatenated in big-endian order, with the result being a negative
number expressed in two's complement form. If the leading byte is
-0x80 (128), the non-leading bytes of the field are concatenating in
+0x80 (128), the non-leading bytes of the field are concatenated in
big-endian order, with the result being a positive number expressed in
binary form. Leading bytes other than 0xff, 0x80 and ASCII octal
digits are reserved for future use, as are base-256 representations of