I want to add that "PIR" (ASCII) was consistently down cased to "pir" (ASCII) even in Turkish locale.

Mats

---

Mats Dufberg

mats.dufberg@internetstiftelsen.se

Technical Expert

Internetstiftelsen (The Swedish Internet Foundation)

Mobile: +46 73 065 3899

https://internetstiftelsen.se/

From: Latingp <latingp-bounces@icann.org> on behalf of Mats Dufberg <mats.dufberg@internetstiftelsen.se>
Date: Thursday, 21 May 2020 at 14:59
To: ICANN Latin GP <Latingp@icann.org>
Subject: [Latingp] Behavior under Turkish locale

I have tested the down casing of LATIN CAPITAL LETTER I WITH DOT ABOVE under Turkish locale. I have set the locale to tr_TR.UTF-8 and done down casing operations.

First I tested in a command line. Under both FreeBSD 12.1 and Linux Mint 193 (more or less the same as Ubuntu 18.04). I tested with the Emacs editor and a Perl script. The behavior showed no special treatment of that down casing. It behaved the same was as under locale sv_SE.UTF-8 and created the sequence of "i" plus "dot above" mark.

I also configured a user on the Linux computer. I arranged a normal login to the graphical system and converted it to Turkish in all senses (which made hard to manage). I tried "PİR.se" in both Firefox and Chromium (open-source version of Chrome). In both cases, the web browser downcased the LATIN CAPITAL LETTER I WITH DOT ABOVE to the sequence that Dennis has already shown, and turned that into the A-label "xn--pir-9dc".

Thinking about it, I do not think this is surprising. There has been no breakthrough of IDN, and in the dominating Internet usage over time LATIN CAPITAL LETTER I WITH DOT ABOVE has not been in use and the special downcasing and upcasing rules for Turkish have been meaningless for domain names.