They conveniently just gloss over very specific wording. How hard is it really to understand these two sentences:
“As to this class there have been doubts, but never as to the first. For the purposes of this case it is not necessary to solve these doubts. “
It ISN’T very hard, and either a reasonably smart or reasonably honest person would simply ask themselves if “Gee, I wonder if another court later on WOULD find it necessary to solve any doubts???” Which would lead them to that Won Kim Ark thingy. But the Vattle Birthers DON’T, which is why I say they are either dishonest or really really dumb.