Compatibility decomposition for Hebrew and Greek final letters

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.

TIA
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Received on Thu Feb 19 2015 - 04:56:38 CST