I found that lower case is less than upper case when the db is created
I tried below
locale en_US.utf8 'A'<'a' false
locale ja_JP.utf8 'A'<'a' true
locale zh_CN.utf8 'A'<'a' false
locale Chinese_China 'A'<'a' false
I am not sure it is normal or not.
But in Chinese, the lower case should be greater than upper, same as
I made some code try to fix it.
It seems to work fine.
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