Bit arithmetic on Unicode characters?

[Richard Wordingham]

On Thu, 6 Oct 2016 12:44:05 -0700
Garth Wallace <gwalla at gmail.com> wrote:

> Other than converting between UTFs, is bit arithmetic commonly
> performed on Unicode characters? I was under the impression that it's
> a rarity if it is done at all.

It's possible to use it for the bulk of case folding, especially if the
program only supports a specific repertoire.

For specialist tasks, exploiting arithmetic relationships make sense.
I would expect that most ASCII clones are handled that way.  The
problem is that manually constructed lookup tables are prone to human
error.

Richard.