Accumulated Feedback on PRI #409

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Date/Time: Sun Oct 27 04:58:54 CDT 2019
Name: 梁海 Liang Hai
Report Type: Public Review Issue (PRI #409)
Opt Subject: U+A9B5 (tolong) should be collated right after U+A9B4 (tarung)

U+A9B5 ꦵ JAVANESE VOWEL SIGN TOLONG is being recognized as a glyph variant of 
U+A9B4 ꦴ JAVANESE VOWEL SIGN TARUNG, in the Core Spec 13.0 and the names list, 
according to L2/19-003 [1] and 158-A122 [2].

This makes a good case for the DUCET to be updated so U+A9B5 (tolong) is collated 
next to U+A9B4 (tarung) as a variant (instead of following all other vowel signs), 
although it’s been 10 years (see note [3]) since U+A9B5 (tolong) was encoded.

For reference, these are two similar cases:

> 03A5  ; [.2341.0020.0008] # GREEK CAPITAL LETTER UPSILON
> 03D2  ; [.2341.0020.000A] # GREEK UPSILON WITH HOOK SYMBOL

> 0061  ; [.1FA2.0020.0002] # LATIN SMALL LETTER A
> ...
> 0251  ; [.1FB1.0020.0002] # LATIN SMALL LETTER ALPHA

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Notes:

[1] L2/19-003, Suspicious identity of U+A9B5 JAVANESE VOWEL SIGN TOLONG 
(https://www.unicode.org/cgi-bin/GetMatchingDocs.pl?L2/19-003)

[2] 158-A122 (http://www.unicode.org/cgi-bin/GetL2Ref.pl?158-A122):
> Action Item for Liang Hai, Editorial Committee: Draft text clarifying the history 
and usage of U+A9B4 JAVANESE VOWEL SIGN TARUNG and U+A9B5 JAVANESE VOWEL SIGN TOLONG 
for the core spec, for Unicode version 13.0.

[3] Change Management for the Unicode Collation Algorithm (https://www.unicode.org/collation/ducet-changes.html)