// taking the Unit from above example, and starting from where we left
console.log(preferencesUnit.value()) // logs {"earth": "oblate ellipsoid"}
// clear the persisted value
preferencesUnit.clearPersistedValue();
// or clearPersistentStorage()
// or clearPersistentStorage(localStorage)
console.log(preferencesUnit.value()) // logs {"earth": "oblate ellipsoid"}
// because only the persisted value is removed, the Unit's value stays intact
// now, refresh the browser window
console.log(preferencesUnit.value()) // logs {"earth": "flat"}
// the initial value is used, because we cleared the persisted value