We sometimes encounter the situation that a server will add over time new
values to existing `enums`.
e.g. in the `enum Animal` example `cat` gets added.
To not break existing clients, we often use something like this:
enum Animal: Int, Codable {
case unknown = 0
case chicken = 1, dog, turkey, cow
}
and all cases which are unknown (like a new `cat` case) will map to `unknown`
instead.
I could probably do this by manually implementing `init(from:)`:
public init(from decoder: Decoder) throws {
// Decodes as a single value; no keys.
let intValue = try decoder.singleValueContainer().decode(Int.self)
if let value = Self(rawValue: intValue) {
self = value
} else {
self = .unknown
}
}
But maybe there is a better way envisioned by the authors of SE-0166?
Cheers
Marc
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