Interface PersistedOptions<T>

Repair or reject a value before it is stored or handed out.

Runs on the value read at startup and on every write, so a store cannot be talked into holding something the app would refuse. Stored data outlives the code that wrote it: a key whose shape changed between versions, or one a player edited by hand, comes back as whatever it was. volumeStep has needed this from the start.

Keep this key on the phone instead of syncing it to the player's character.

The exception, not the rule — the point of server-backed storage is that a preference follows the player. wallpaperStore is the one that needs it: a custom wallpaper is a base64 data URL of unbounded size, and syncing it would put megabytes across the NUI bridge and into MySQL every time a color changed.

Declared at the store rather than in a list inside the sync layer, because a hardcoded list somewhere else is one nobody thinks to update when they add a store.