On 2/28/2013 10:39 AM, Dmitry Olshansky wrote: > That would mean that when you see 0 or 0x1A you do a check to see if that's the > end of input then decide it's really the end of input. A 0 or a 0x1A is the end of valid D source. Period. But that doesn't mean the sentinel has to be a tuple.