On 26/05/2020 22.51, Steve Downey via SG16 wrote:
> Find attached a draft of the UAX31 paper for discussion.
> Viewable at http://htmlpreview.github.io/?https://github.com/steve-downey/papers/blob/master/generated/p1949.html
> Source at https://github.com/steve-downey/papers/blob/master/p1949.md

I had asked earlier for some prose-text statement on the difficulty
of checking NFC.

I can only find

"Detection of un-normalized text is fairly straight-forward, and GCC 10 already produces a warning. Normalizing to NFC is not much more difficult."

which is lacking a bit of depth.

What exactly do I have to do to check for NFC? Check some bits in the code points?
Consult some Unicode tables? Something else?

Jens