[grep bug?] -i odd behavior on multibyte locale

[Alecs King]

6.0-current as of May 27.
world cvsup'd & built at May 25.

[alecs@~]$ echo $LC_CTYPE
zh_CN.GBK
[alecs@~]$ echo a | grep -i A
a
[alecs@~]$ echo a | grep -i a
a
[alecs@~]$ echo A | grep -i A	# XXX
[alecs@~]$ echo A | grep -i a	# XXX

[alecs@~]$ export LC_CTYPE=C
[alecs@~]$ echo a | grep -i A
a
[alecs@~]$ echo a | grep -i a
a
[alecs@~]$ echo A | grep -i A
A
[alecs@~]$ echo A | grep -i a
A


-- 
Alecs King