Unicode 7.0.0, (combining) Hamza Above, and normalization

[Shawn Steele]

> Computers are dumb, homographs are confusing for all the reasons we know, so our least bad solution is to forbid them even in places where they'd be linguistically harmless.

How?

(you confused me with "linguistically harmless".  I read that as not damaging my language, yet forbidding characters is sort of linguistically damaging by definition).