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Upgrade from mysql 4.1 to mysql 5.5

I was going through upgrade process of mysql server. It is mentioned that to upgrade from 4.1 to 5.5 we need to upgrade step by step like first to 5.0,5.1 ...5.4 and then 5.5. I have some questions : ...
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How can we check for data integrity when we upgrade from MySQL 4.1 to MySQL 5.5?

By data integrity, I mean: Schema integrity Data (record level) integrity Checksum was an option, but since the storage format for some data types in MySQL 5.5 has been changed, it won't be ...