[NTG-context] What's the difference between \setupdirections[bidi=global, method=one] and \setupdirections[bidi=global, method=two]?

Hi, the subject line says it already. What's the difference between \setupdirections[bidi=global,method=one] and \setupdirections[bidi=global,method=two]? In which case should I use `method=one`, when is `method=two` better? Best, Denis