mysql，重音不敏感

Question

根据：https://dev.mysql.com/doc/refman/5.6/en/charset-collation-names.html

"latin1_general_ci is explicitly case insensitive and implicitly accent insensitive"

测试1

SET @a =_latin1'é' COLLATE latin1_general_ci;
SET @b =_latin1'e' COLLATE latin1_general_ci; 
SELECT @a=@b; # returns 0

测试2

SET @a =_latin1'é' COLLATE latin1_general_ci;
SET @b =_latin1'É' COLLATE latin1_general_ci; 
SELECT @a=@b; # returns 0

看起来它工作不正常，为什么？