MySQL Installer Guide
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The configuration process took a long time to complete if the server was installed without removing the data directory of a previous server installation. The installer performed an in-place upgrade which could take a long time.
As of this release, the in-place upgrade is performed after the configuration process, if required. (Bug #34680745)
The MySQL Router configuration page performed an unnecessary length validation on the server password provided. As of this release, the MySQL Router configuration page no longer performs length validations on the supplied password. (Bug #29036252)
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It was not possible to create a username using special characters.
As of this release, you can define usernames with special characters by enclosing the username in single quotes ('), double quotes ("), or back ticks (`). (Bug #100437, Bug #31779691)