Is this a bug of aset?

[pluskid]

Hello everyone!
I'm using today's cvs version of Emacs 23(unicode branch):

M-x version
GNU Emacs 23.0.0.2 (i686-pc-linux-gnu, GTK+ Version 2.8.20) of 2006-10-11 on
kid

and eval this piece of code

(let ((foo "foobar"))
  (aset foo 0 ?\我))

the Chinese character 我  means `I' in English. Then I get the following
error:

Debugger entered--Lisp error: (args-out-of-range "foobar" 25105)
  aset("foobar" 0 25105)
  (let ((foo "foobar")) (aset foo 0 25105))
  eval((let ((foo "foobar")) (aset foo 0 25105)))
  eval-last-sexp-1(nil)
  eval-last-sexp(nil)
  call-interactively(eval-last-sexp)

But I tested on a Emacs of the version 22.0.51.2, it runs without any error
and produce the correct answer: foo becomes "我oobar"

I don't know whether you have correct font to display the Chinese character
 `我' here, it is 25105 in Emacs 23 and 42834 in Emacs 22 . In fact, any
Chinese
(or other i.e. Jananese) multibyte character may cause this problem, I
think(I'v
tested many, but I can't test all, of course. :p)

Any idea?

Best regards!

BTW: My friends tell me that if there's initially some Chinese character in
the string foo , this error won't occur. Maybe this could be some help.
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