class Dry::Types::Maybe

def call(input)
  input.is_a?(Dry::Monads::Maybe) ? input : Maybe(type[input])
end

def default(value)
  if value.nil?
    raise ArgumentError, "nil cannot be used as a default of a maybe type"
  else
    super
  end
end

def maybe?
  true
end

def try(input)
  Result::Success.new(Maybe(type[input]))
end