Support of Old Church Slavic language sublocale in CLDR

[Соус-кун via CLDR-Users]

Dear all,

Two years ago I've openned the ticket
https://unicode.org/cldr/trac/ticket/9238 about adding separate sublocale
for Old Church Slavic language within the "cu" CLDR locale.
The ticked was closed for formal reasons, but I believe this issue needs
further discussion.

Though I have explained the problem in the ticked, I would like to point
out the main issues here again:
- Linguists consider 'Old Church Slavic' and 'Church Slavic' two different
languanges (see https://en.wikipedia.org/wiki/Old_Church_Slavonic and
https://en.wikipedia.org/wiki/Church_Slavonic_language for reference).
- ISO 639 code "cu"/"chu" is shared for both (
http://www-01.sil.org/iso639-3/documentation.asp?id=chu). Other instances
as IANA subtags list follow this convention. CLDR also seems to follow it
with having only one "cu" locale variant called "Church Slavic".
- Hence there are two main problems: 1) there are no officially designated
subtags for distinguish "Old Church Slavic" and "Church Slavic"; 2) CLDR
now supports only one possible variation for "cu"code, the "Church Slavic"
one.

So I would like to ask whether it's still possible to add "Old Church
Slavic language" locale to CLDR? The data itself can be easily created via
cloning the existing "Church Slavic" one and further fixing of spelling (I
can work on that as the Old Church Slavic student and enthusiast), but what
the subtag is supposed to be? I'd say, from a formal standpoint it's the
main problem, as ISO and IANA did not care about possible language variants
while implementing code "cu".

Best regards,

Therapont
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