>> The characters are "majuscule S with a diagonal stroke", and
>> "minuscule s with a diagonal stroke". This letter is used to
>> represent a voiceless retroflex fricative, which is distinct from the
>> alveolar fricative "s" and the palato-alveolar "sh".
> What's wrong with <U+0073, U+0338> and <U+0053, U+0338>?
The preferred approach seems to be to encode these precomposed
letters-with-diagonal-slash separately, and simply not include canonical
decompositions for them.
I think I remember reading that the rationale is that the decomposed
versions are harder for rendering engines to compose on the fly,
compared to letters with "ordinary" diacritics that sit above or below