I think if there are no further checks in presave(), the data will just be written to the database.
At least this is how the User Datamanager behaves (with c:\winnt as eMail).
This might cause inconsistent data.
However, it should not cause mySQL-Errors.
But if you also set clean to false, the datatype will not be checked - and you might run into mySQL Errors and SQL injection vulnerbilities.
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