grep single-ascii-char matches Chinese

[Dan Jacobson]

I do
$ grep @ file
and grep finds all the Chinese characters with '@'
as one of their bytes, including the very common "yi1" meaning "one".
Emacs' isearch-forward wouldn't do that, thank goodness.

$ grep A file, grep B file... same problem.

I have
LC_MESSAGES=zh_TW.Big5
LC_TIME=zh_TW.Big5
LC_NUMERIC=zh_TW.Big5
LC_CTYPE=zh_TW.Big5
LC_MONETARY=zh_TW.Big5
LC_COLLATE=zh_TW.Big5

grep (GNU grep) 2.4.2 on Mandrake 7.2
by the way, I wish grep --version would tell what options grep was
compiled with.

I do
$ grep '[Chinese chars]' file
and it finds them ok...

[Perhaps I discovered a big bug because not often do folks grep for
single ascii chars?   Or is there some fundamental concept I'm not
grabbing here as usual?]
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