Why require a fieldseparator after a null value?

[RobThree]

Why would you require a field separator (0xFF) after a null value (0xFE)? Why not have 0xFE signal both the null value and "end of field"? That would make reading RSV much easier because when reading a 0xFE you can immediately emit the null value and don't need any more shenanigans to wait for reading the 0xFF, looking back in the buffer if there's one and only one byte in it and it is null etc. That way you can make it 'streaming' much easier IMHO.