I don't know specifically, but I'd guess the former over the latter. Adding a lazy DFA is a lot of work. There is an issue tracking the addition of a lazy DFA o

I don't know specifically, but I'd guess the former over the latter. Adding a lazy DFA is a lot of work. There is an issue tracking the addition of a lazy DFA on the golang tracker. My guess is that it's up to a contributor to do it.