'Hashable.hashValue' is deprecated as a protocol requirement; conform type 'JSONNull' to 'Hashable' by implementing 'hash(into:)' instead

[tciuro]

The current hash helper looks like this:

public class JSONNull: Codable, Hashable {

    ...

    public var hashValue: Int {
        return 0
    }

    ...
}

It should be updated with this:

public class JSONNull: Codable, Hashable {

    ...

    public func hash(into hasher: inout Hasher) {
        hasher.combine(0)
    }

    ...
}

Cheers!