[plt-scheme] Unicode on the cheap

At Sat, 24 Jan 2004 21:29:54 -0700, Matthew Flatt wrote:
> A "code point" is a Unicode number. A "code unit" in a particular
> encoding scheme is one number used toward the encoding of code points.

Does the original question not make any sense if it were asked in terms
of code units? I've done some more reading on unicode and utf-8 and it
still seems to be a sensible question. Here it is, rewritten:

  If I were to put four of those chinese characters into string (eg by
  calling `string' with four arguments), why wouldn't the resulting
  string have a `string-length' of four?

Robby