Bug: Routes and Namespace

[yrneh-mi]

Bug?
Namespace in routes. Value set in $routes->setDefaultNamespace('App\Controllers'); is not used when doing $routes->get('/', 'Core\Dashboard::index');.

CodeIgniter 4 version
CodeIgniter 4.0.0.0-rc3

Affected module(s)
Routing

Expected behavior, and steps to reproduce if appropriate
The controller app/Controller/Core/Dashboard.php:

<?php namespace App\Controllers\Core;

use App\Controllers\BaseController;

class Dashboard extends BaseController
{
    public function index()
    {
        return 'Hello';
    }
}

Using it like this in app/Config/Routes.php:

$routes->setDefaultNamespace('App\Controllers');
$routes->get('/', 'Core\Dashboard::index'); // Core is the namespace
$routes->get('/one', 'Core\ExampleOne::index'); // Core is the namespace
$routes->get('/two', 'Testing\ExampleTwo::index'); // Testing is the namespace

Expected output:

App\Controllers\Core\Dashboard::index
App\Controllers\Core\ExampleOne::index
App\Controllers\Testing\ExampleTwo::index

Actual output:

Core\Dashboard::index
Core\ExampleOne::index
Testing\ExampleTwo::index

This would be an error and would be a 404 page not found. The value set in $routes->setDefaultNamespace('App\Controllers'); is not used.

This works though (but....):

$routes->setDefaultNamespace('App\Controllers'); // Not used at all

$routes->get('/', 'App\Controller\Core\Dashboard::index');
$routes->get('/one', 'App\Controller\Core\ExampleOne::index');
$routes->get('/two', 'App\Controller\Testing\ExampleTwo::index');

or

$routes->setDefaultNamespace('App\Controllers'); // Not used at all unless below $baseNamespace is used

$baseNamespace = $routes->getDefaultNamespace();

$routes->get('/', $baseNamespace . '\Core\Dashboard::index');
$routes->get('/one', $baseNamespace . '\Core\ExampleOne::index');
$routes->get('/two', $baseNamespace . '\Testing\ExampleTwo::index');

or

$routes->setDefaultNamespace('App\Controllers'); // Not used at all

$routes->get('/', 'Dashboard::index', ['namespace' => 'App\Controllers\Core']);
$routes->get('/one', 'ExampleOne::index', ['namespace' => 'App\Controllers\Core']);
$routes->get('/two', 'ExampleTwo::index', ['namespace' => 'App\Controllers\Testing']);

// $routes->group() also works
// $routes->group('', ['namespace' => '', function ($routes) {}]);

Context

• OS: Windows 10 Pro 64bit
• Web server: N/A
• PHP version: 7.3.10