default numbering system for Arabic locales

[Richard Wordingham via CLDR-Users]

On Mon, 22 Apr 2019 21:43:46 -0700
Markus Scherer via CLDR-Users <cldr-users at unicode.org> wrote:

> On Mon, Apr 22, 2019 at 7:37 PM Georges MURR via CLDR-Users <
> cldr-users at unicode.org> wrote:
> 
> > Is there a default numbering system for Arabic locales?  Is it the
> > same for all countries? I am asking because I visited many Arabic
> > government official websites and they all use Latin digits for both
> > numbers and dates. All the Arabic newspapers websites that I
> > visited do the same. Is there a default mapping between locale and
> > numbering system in CLDR locale data? 
> 
> There is a default numbering system for all locales:
> https://www.unicode.org/cldr/charts/latest/by_type/core_data.numbering_systems.html
> 
> For Arabic, the default is to use "native" (Arabic-script) digits, as
> is customary in many countries like Egypt and Saudi Arabia.
> Some regional variants, like Arabic in Morocco or Algeria, override
> this to use ASCII digits.

But as I understand it, ASCII digits are the correct encoding* of the
Western Arabic digits!  The (near) Eastern Arabic digits (U+0660 etc.)
are not 'native' to the western part of the Arab world.

*Is there a Bidi test on printed text to distinguish, say, U+0662 from
U+06F2 EXTENDED ARABIC-INDIC DIGIT TWO?

Richard.