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From: Dave Love <d.love@dl.ac.uk>
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Subject: Re: \201 irritation! :-)
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>>>>> "ZSH" == ShengHuo ZHU <zsh@cs.rochester.edu> writes:

 ZSH> Maybe it is OK for characters between \200-\237, but not for those
 ZSH> between \240-\377, i.e. eight-bit-graphic. unibyte-char-to-multibyte
 ZSH> converts them to latin-iso8859-1.  

Of course.

 ZSH> Suppose to insert a unibyte string with \337 to a multibyte
 ZSH> buffer, I always get ß, unless using the number (insert "0123"
 ZSH> 223 "ABCD").

Yes, text is meant to be converted that way.

 ZSH> Maybe unibyte-char is converted to latin-iso8859-1 

The conversion depend on `nonascii-insert-offset', though I think that
will default to Latin-1/

 ZSH> on purpose for compatibility, but in the second case it would be
 ZSH> ugly.  

I'm not sure I understand that.

 ZSH> It illustrates some cases in Gnus, getting data from network (in
 ZSH> a unibyte buffer) then copying them to multibyte buffer for
 ZSH> decoding.

That seems to me like the wrong thing to do.