Allow enum types to be unionable.
enum InputOptions Required Optional NoValue end mode = InputOptions::Required | InputOptions::NoValue mode.required? # => true mode.no_value? # => true
The use case for this, for this example, would have having a paramater that has to be present but does not have a value associated with it. e.x.
./myApp --flag would be valid, but
./myApp --flag=123 would not be.