I would like to convert a string in a json format to a request payload through swift Codable. However, after converting, the value turns from 24.21 to
24.210000000000001. how should I fix it?

public func alertData(json: String) throws -> Data? {
    guard let jsonData = try json.data(using: .utf8) else {
        return nil
    }
    return jsonData
}

struct Payload: Codable {
    var order = OrderData()
}
struct OrderData: Codable {
    var amount: Double?
}

let json = "{"order": {"amount": 24.21}}"
let data = try alertData(json: json)!
let payload = try JSONDecoder().decode(Payload.self, from: data)
print(payload) /// Payload(order: prog.OrderData(amount: Optional(24.210000000000001)))