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From: Dave Love <d.love@dl.ac.uk>
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Subject: Re: imap breaks latin-1 characters
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>>>>> "ZSH" == ShengHuo ZHU <zsh@cs.rochester.edu> writes:

 ZSH> The problems discussed are handling unibyte string or buffer.
 ZSH> Unibyte buffer was introduced in Gnus, partially because early
 ZSH> Emacs 20 could not handle 8bit data properly.

So this is just a problem with the Gnus code?

 ZSH> which means 8bit unibyte characters (\240-\377) are converted to
 ZSH> latin-iso8859-1 characters instead of eight-bit-graphic ones
 ZSH> (see DEFAULT_NONASCII_INSERT_OFFSET in the Emacs source).

Presumably you can bind `nonascii-translation-table' if necessary.  It
seems reasonable to be able to use a zero `nonascii-insert-offset'
now.  Feel free to suggest it if that will solve a problem.

 ZSH> Now, suppose to insert an encoded (unibyte) string (maybe from
 ZSH> some unibyte buffer) into a multibyte buffer, then decode it.

Decoding in a unibyte buffer seems a better idea if it needs to be
done explicitly.