Re: u32_normalize UNINORM_NFKC on 0xD800

[Bruno Haible]

Simon Josefsson wrote:
> I'm calculating this IDNA2008 property
> 
>    toNFKC(toCaseFold(toNFKC(cp))) != cp
> 
> for all code points.

It makes no sense to consider non-character code points here. Citing again
the Unicode standard, chapter 3 [1], section 3.8:

  "High-surrogate and low-surrogate code units are used only in the context
   of the UTF-16 character encoding form."

> Is this impossible to do with the u32_normalize interface?

Yes, you are passing invalid input to the u32_normalize function.

Bruno

[1] http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf