Re: Code point vs. scalar value

[Stephan Stiller]

In what way does UTF-16 "use" surrogate code /points/? An encoding form 
is a mapping. Let's look at this mapping:

 * One _inputs_ scalar values (not surrogate code points).
 * The encoding form will _output_ a short sequence of encoding
   form–specific code units. (Various voices on this list have stated
   that these should never be called code points.)
 * The _algorithm mapping from input to output_ doesn't make use of
   surrogate code points. (Even though the Glossary states, under
   "Surrogate Code Point", that they are "for use by UTF-16".) The only
   "use" is indirect, through awareness of the positioning and size of
   the range of non-code-point scalar values.