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1. Encryption.swift Encryption.swift

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       func encrypt(_ text: String) -> String? {

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           guard

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               let bundle = Bundle(identifier: "com.example.bundle.identifier"),

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               let url = bundle.url(forResource: "certificate", withExtension: "der"),

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               let certData = try? Data(contentsOf: url),

2. Failable Codable initialiser for Raw... Failable Codable initialiser for RawRepresentable types

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   extension RawRepresentable where RawValue: Decodable {

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       init?(from decoder: Decoder) throws {

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           self.init(rawValue: try decoder.singleValueContainer().decode(RawValue.self))

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       }

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   }

3. Protocols, inheritance, default impl... Protocols, inheritance, default implementations, and optional methods

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   import Foundation

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   protocol P {

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       var required: String { get }

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   }

4. Codable doesn't play nicely with sub... Codable doesn't play nicely with subclasses

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   import Foundation

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   class C: Codable {

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       var p: String?

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   }