> > Note: Perhaps a solution is to have two variants of the procs, one for 

> > code points and one for code units. The code units variants would 
> > guarantee O(1) and the code point ones wouldn't.
> 
> That might make sense.  (I assume you mean "Unicode scalar value"
> rather than "code point".  I checked http://www.unicode.org/glossary/ )

Yes.

> The goal would be to permit at least UTF=8 and UTF-16 internal
> representations.  (Other representations should also be allowed,
> but might be less useful.)  The O(1) functions would get and set
> the 8-bit or 16-bit values.

Yes.
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