Makes sense to me; I like mentioning the major-use writing system to make the point, but it also makes it clear that it is broader than a single case. --Rich Richard Merdinger VP, Domains - GoDaddy rmerdinger@godaddy.com<mailto:rmerdinger@godaddy.com> From: <ua-discuss-bounces@icann.org> on behalf of Andrew Sullivan <ajs@anvilwalrusden.com> Date: Wednesday, August 9, 2017 at 3:19 PM To: "ua-discuss@icann.org" <ua-discuss@icann.org> Subject: Re: [UA-discuss] Programming Language Hacks - UA103 On Wed, Aug 09, 2017 at 04:13:35PM +0000, Mark Svancarek via UA-discuss wrote: Actually, we recently discovered an Edge bug (via the browser review) where the order of labels in a RTL.RTL.ASCII domain name were transposed during rendering. So I like calling it out explicitly. This has been a regularly-recurring bug in various rendering engines since at least 2008, because I recall the demonstrations of it during the idnabis WG, and then seeing it in a completely different context during the VIP work for ICANN in 2011 or '12. It's not always only Arabic: at least one of the examples was reproducible in any bidi context. I seem to recall one example where the wire order [firstlabel]RTL[secondlabel]RTL[thirdlabel]LTR[fourthlabel]NULL got rendered as RTL.LTR.RTL Which I thought was a pretty cool bug. I have no idea how it happened that way, though I recall walking mysef through the bidi algorithm at the time and figuring out what the problem must have been. Bidi is hard. I therefore think it wise not to call out Arabic especially -- but maybe point out that Arabic is perhaps the most prominent writing system that uses RTL, so that programmers aren't tempted to dismiss the problem as a "corner case". Big corner, the Arabic-using population! Best regards, A -- Andrew Sullivan ajs@anvilwalrusden.com<mailto:ajs@anvilwalrusden.com>