In some wikis Compact Language Links may have to be deployed gradually: First to anonymous users, new user accounts and users who already enabled the beta feature. This will require defining it as default for new users, and migrating the old preference for existing users.
Possible implementation ideas:
- Use a live migration
- Prepare script for preference migration
- Set preference to true by default and false for rest? Or default false and true for existing users and with hook for new users.