$this->validate bug?

Code:

<?php namespace App\Controllers;

use CodeIgniter\Controller;

class Login extends Controller
{
    public function index()
    {
        helper('form');
        if (! $this->validate($this->request, []))
            print view('login');
        else
            print "It worked";
    }

    //--------------------------------------------------------------------

}

I get an error:
TypeError
Argument 2 passed to CodeIgniter\Validation\Validation:etRules() must be of the type array, null given, called in /Users/satchwinston/Sites/CI4dev/system/Controller.php on line 187

Code:

public function validate(RequestInterface $request, $rules, array $messages = null): bool
183     {

Shouldn't "array $messages = null" be "array $messages = []"?

Simpler is always better

Looks like a new download of CI4 does not have this problem.

Simpler is always better