When working with decimals encoding a value of e.g 68.32 does not result in the same value when decoding it afterwards.

I'm using the suggestion from https://forums.swift.org/t/decimal-has-no-rounded/14200/12 to round the value before encoding it.

Might this be a bug in the JSONEncoder / JSONDecoder? Is there any reliable workaround?

Here is an example code:

import Foundation

let decimalValue: Decimal = 68.32 // 68.31999999999998976
let roundedDecimalValue = decimalValue.rounded(2, .plain) // 68.32

do {
    let data = try JSONEncoder().encode(roundedDecimalValue)
    let decodedDecimal = try JSONDecoder().decode(Decimal.self, from: data) // 68.31999999999999
    print(decodedDecimal)
} catch {}

extension Decimal {
    mutating func round(_ scale: Int, _ roundingMode: NSDecimalNumber.RoundingMode) {
        var localCopy = self
        NSDecimalRound(&self, &localCopy, scale, roundingMode)
    }

    func rounded(_ scale: Int, _ roundingMode: NSDecimalNumber.RoundingMode) -> Decimal {
        var result = Decimal()
        var localCopy = self // 68.31999999999998976
        NSDecimalRound(&result, &localCopy, scale, roundingMode)
        return result // 68.32
    }
}

Edit: I've ended up implementing a solution based on Swift: Decode imprecise decimal correctly