public final class PropertyMapping<L: AnyObject, R: AnyObject> {
    
    public init<V>(_ lhs: WritableKeyPath<L, V>, _ rhs: WritableKeyPath<R, V>) where V: Equatable {
        self.neglect = true
    }


    #if (swift(>=5.4) && swift(<5.5)) || swift(>=5.6)
    // Not in Swift 5.5
    public init<LV>(_ lhs: WritableKeyPath<L, LV>) where LV: Equatable, L == R {
        self.neglect = true
    }
    #endif


    
    let neglect: Bool
}

#if (swift(>=5.5) && swift(<5.6))
public extension PropertyMapping where L == R {
    
    // Swift 5.5 only
    convenience init<LV>(_ lhs: WritableKeyPath<L, LV>) where LV: Equatable, L == R {
        self.init(lhs, lhs)
    }
    
}
#endif // Swift 5.5