@State of optional: type spelling Optional<Int> is not the same as Int?

Using Swift
8

This must be hand crafted in SwiftUI because I have the opposite problem with the generated Decodable.init(from:): Property wrapper initialisation issues.

In the following example it's impossible (but I really hope I'm wrong) to access the 10 due to the way the compiler generates the initializer. Wrapper(importantValue: 10) is called before Cow(from:) but it's then entirely thrown away.

struct Cow: Codable {
    @Wrapper(importantValue: 10) var legs: UInt
    
    // This is generated by the compiler
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        self._legs = try container.decode(Wrapper<UInt>.self, forKey: .legs)
    }
}