>From an implementation perspective, it is generally easiest to add it (and
>maybe its presentation forms) into the Private Use Area. Otherwise some
>language-specific processing might have to be done if Uighur Heh is
>represented as U+0647.
The fundamental question is whether to encode distinctions to be made
during the rendering process. A smart font could easily distinguish these
behaviors without code distinction as long as either a language or font
binding were present (in the case of mixed Arabic/Uighur text), or simply
use one default behavior for mono-lingual Uighur text.
A more apt question might be whether there are informational reasons
to unify the two for performing other operations such as searching,
lexical analysis, etc.
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