A property wrapper to round decimal value

Rounded.swift

@propertyWrapper
struct Rounded {
    private(set) var value: Decimal = 0.0
    let rule: NSDecimalNumber.RoundingMode
    let scale: Int

    var wrappedValue: Decimal {
        get { value }
        set { value = roundedDecimal(value:newValue,scale: scale, mode: rule) }
    }

    private func roundedDecimal(value:Decimal, scale: Int = 0, mode: NSDecimalNumber.RoundingMode) -> Decimal {
        var result = Decimal()
        var valueToChange = value
        NSDecimalRound(&result, &valueToChange, scale, mode)
        return result
    }
}

// Example
struct GameResult {
    @Rounded(rule: NSDecimalNumber.RoundingMode.up,scale: 4)
    var score: Decimal
}

var result = GameResult()
result.score = 3.14159265358979
print(result.score) // 3.1416

Hi,
How can I use this with codable?