#63 a privilege can be stored multiple times in security_data

[Kilian]

If you grant the same privilege to the same user multiple times, each of these granted privileges (which are in fact just one) will be stored in the db_security_data document, blowing up the privilege section of the user. If you revoke a privilege, which has been granted multiple times, all the identical privileges are removed at one go.

[Ivan Shcheklein]

Why does this behavior bother you?
Personally, don't think this a bug. AFAIK, MySQL behaves the same way.

[Kilian]

Well, it does not bother me that much, I just did not expect this behavior and thought it might be better to report it. If you say it's not a problem, I believe you :-)

regards kilian