class T::Types::TypedSet::Untyped

def initialize
  super(T::Types::Untyped::Private::INSTANCE)
end

def valid?(obj)
  # Re-implements non_forcing_is_a?
  return false if Object.autoload?(:Set) # Set is meant to be autoloaded but not yet loaded, this value can't be a Set
  return false unless Object.const_defined?(:Set) # Set is not loaded yet
  obj.is_a?(Set)
end