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      19.5.1.38 Replication and User Name Length
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   The maximum length for user names in MySQL 8.4 is
        32 characters. Replication of user names longer than 16
        characters fails when the replica runs a version of MySQL
        previous to 5.7, because those versions support only shorter
        user names. This occurs only when replicating from a newer
        source to an older replica, which is not a recommended
        configuration.
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