NSSecureCoding NSKeyedUnarchiver Bug.swift

//  Test 2 failed
//  Error Domain=NSCocoaErrorDomain Code=4864 "*** -[NSKeyedUnarchiver decodeObjectForKey:]: 
//      value for key (NSAttributes) contains too many nested (NSDictionary)s"
//      UserInfo={NSDebugDescription=*** -[NSKeyedUnarchiver decodeObjectForKey:]: value for
//      key (NSAttributes) contains too many nested (NSDictionary)s}
//  Test 3 succeeded
//  Finished


import Cocoa


class MyObj: NSObject, NSSecureCoding {
    
    class var supportsSecureCoding: Bool {
        return true
    }
    
    func encode(with coder: NSCoder) {
        let attrStr = NSAttributedString(string: "text", attributes: [:])
        coder.encode(attrStr, forKey: "attributedString")
    }
    
    required init?(coder: NSCoder) {
        let attrStr = coder.decodeObject(of: NSAttributedString.self, forKey: "attributedString")
        precondition(attrStr != nil)
    }
    
    override init() {
        
    }
}


// Archiving a single instance works fine
do {
    let data = try! NSKeyedArchiver.archivedData(withRootObject: MyObj(), requiringSecureCoding: true)
    let _ = try NSKeyedUnarchiver.unarchivedObject(ofClass: MyObj.self, from: data)
} catch let err {
    print("Test 1 failed")
    print(err)
}


// Archiving an array of instances fails
do {
    let data = try! NSKeyedArchiver.archivedData(withRootObject: [MyObj()], requiringSecureCoding: true)
    let _ = try NSKeyedUnarchiver.unarchivedArrayOfObjects(ofClass: MyObj.self, from: data)
} catch let err {
    print("Test 2 failed")
    print(err)
}



// Doing it with regular NSCoding works fine
do {
    let data = try! NSKeyedArchiver.archivedData(withRootObject: [MyObj()])
    let root = NSKeyedUnarchiver.unarchiveObject(with: data)
    precondition(root != nil)
    print("Test 3 succeeded")
}

print("Finished")