Stephane Bortzmeyer wrote:
which means RFCs should be pure ASCII just as programming languages use pure ASCII.
I suggest that you watch this presentation at IETF 95 <https://www.ietf.org/proceedings/95/hrpc.html>
Arabic text in presentation slides, which is illegible for most participants, is a good example that we must use ASCII/English only for IETF discussion involving really international participants, if commonly recognized characters and languages by them are ASCII/English only. That's the internationalization. Still, it is a good idea that a local chapter of ISOC uses local characters and a local language for local discussions on IETF activities, which was what I did with ISOC Japan chapter. That is good localization but is not internationalization. So? Masataka Ohta