simonbs

/**
 * I needed a property wrapper that fulfilled the following four requirements:
 *
 * 1. Values are stored in UserDefaults.
 * 2. Properties using the property wrapper can be used with SwiftUI.
 * 3. The property wrapper exposes a Publisher to be used with Combine.
 * 4. The publisher is only called when the value is updated and not
 *    when_any_ value stored in UserDefaults is updated.
 *
 * First I tried using SwiftUI's builtin @AppStorage property wrapper