a95a6b106c
- normalize username into lowercase (this is already ASCII only) - permit users to login with their username with insensitive case - if a disabled account is reactivated and got a collision, it will normalize it too - server will stop on collision (ex: 2 entries with `Alice` and `alice`) in a such case admin can run: ``` oxicloud migrate lowercase-usernames --dry-run ``` then ``` oxicloud migrate lowercase-usernames ```