Pinned

1. UserDefaultsWrapper using property w... UserDefaultsWrapper using property wrapper

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   @propertyWrapper

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   struct Storage<T: Codable> {

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       private let key: String

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       private let defaultValue: T

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2. Implementing Copy-on_Write behavior ... Implementing Copy-on_Write behavior for your custom value types

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   final class Ref<T> {

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     var val : T

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     init(_ v : T) {val = v}

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   }

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