PKPaymentAuthorizationResult errors that are of Swift.Error type will crash the host application Radar: 35131271

ViewController.swift

//
//  Copyright © 2017 Peter Goldsmith. All rights reserved.
//

import UIKit
import PassKit

struct BananaError: Error {}

class ViewController: UIViewController {
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        let request = PKPaymentRequest()
        request.countryCode = "US"
        request.currencyCode = "USD"
        request.supportedNetworks = [PKPaymentNetwork.masterCard]
        request.merchantCapabilities = .capability3DS
        request.merchantIdentifier = "com.test"
        request.paymentSummaryItems = [ PKPaymentSummaryItem(label: "Banana", amount: 30.0)]

        if let paymentViewController = PKPaymentAuthorizationViewController(paymentRequest: request) {
            paymentViewController.delegate = self
            self.present(paymentViewController, animated: true)
        }
    }
}

extension ViewController: PKPaymentAuthorizationViewControllerDelegate {
    func paymentAuthorizationViewControllerDidFinish(_ controller: PKPaymentAuthorizationViewController) {
        controller.dismiss(animated: true)
    }

    func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {

        // The following error type will cause an exception:
        // `-[NSXPCEncoder _checkObject:]: This coder only encodes objects that adopt NSSecureCoding (object is of class '_SwiftValue').`
        let bananaError: Error = BananaError()

        // The following error will not cause the encoding exception.
        // let bananaError: Error = NSError(domain: "Banana", code: 0, userInfo: [NSLocalizedDescriptionKey: "Banana"])

        let authorisationResult = PKPaymentAuthorizationResult(status: .failure, errors: [bananaError])

        completion(authorisationResult)
    }
}