John Wilcock wrote: > All *known* vertical scripts! What happens if someone discovers a > hitherto-unknown vertical script that is never written horizontally?
I predict that the people who want to write about it will quickly render it LTR horizontally, to match the metadirectionality of the script they use to write about it. Scholars already regularly turn RTL epigraphy into LTR when they want to cite it in text (other than in facsimiles), to avoid the bidi problem. Also, you'd have to go pretty far out to find a "hitherto-unknown vertical script" that has escaped the eagle eyes of the Unicode Roadmap committee. See, for example: http://www.unicode.org/roadmaps/smp-3-1.html --Ken
