allow instantiation of optional typed parameter

Foo.php

<?php

class Foo
{
    public function bar(Response $response = new Response())
    {
        // ..
    }
    
    // Instead of:
    
    public function bar(Response $response = null)
    {
        if (null === $response) {
            $response = new Response();
        }
        
        // ..
    }
}

@adrienbrault Well, yes this won't work in that case.