Compatibility decomposition for Hebrew and Greek final letters

[Michael Everson]

On 19 Feb 2015, at 10:55, Eli Zaretskii <eliz at gnu.org> wrote:

> Does anyone know why does the UCD define compatibility decompositions
> for Arabic initial, medial, and final forms, but doesn't do the same
> for Hebrew final letters, like U+05DD HEBREW LETTER FINAL MEM?  Or for
> that matter, for U+03C2 GREEK SMALL LETTER FINAL SIGMA?
> 
> The relevant application where this would matter is text search, where
> these letters might be folded to the same code point for the purposes
> of comparison.

Such comparisons happen at a different level, I think. 

Michael Everson * http://www.evertype.com/