When JSON encoding a Double there are too many decimal places

If you are trying to generate JSON and a double is encoded with loads of decimal places and weird “1” at the end, like this:

struct Coordinate: Encodable {
    let latitudeInDegrees: Double
    let longitudeInDegrees: Double
    let accuracyInMeters: Double
}
let coordinate = Coordinate(latitudeInDegrees: 37.785834, longitudeInDegrees: -122.406417, accuracyInMeters: 5)

Generates JSON:

{
    "coordinate" : {
        "accuracyInMeters" : 5,
        "latitudeInDegrees" : 37.785834000000001,
        "longitudeInDegrees" : -122.406417
    }
}

Change the type from Double to Decimal:

struct Coordinate: Encodable {
    let latitudeInDegrees: Decimal
    let longitudeInDegrees: Decimal
    let accuracyInMeters: Decimal
}