[NTG-context] \setupdirections, methods one, two, and three

The latest beta complains and stops when I try to process a book that has \setupdirections[bidi=global, method=one] for several, scattered phrases in Arabic and Hebrew (which I do not read). It works, however, when I set method=two or method=three. What is the difference between these methods and, am I right that the output will be the same if I switch to method two or three? Alan