Method demo

examples/demo.php:466–473

()

    public function getPens(): \ArrayIterator { return new \ArrayIterator([new Pen()]); }

    public function demo(): void
    {
        $pen = $this->getPens()->current();
        $pen->write();                            // ArrayIterator<int, Pen> → current() returns Pen

        // Direct chain also works:
        $this->getPens()->current()->write();     // same resolution through the chain
    }
}