Fix $listener param type hint in listen() method of EventDispatcher

[papalapa]

Illuminate\Events\Dispatcher has method listen with two arguments $events and $listener:

/**
 * Register an event listener with the dispatcher.
 *
 * @param string|array    $events
 * @param \Closure|string $listener
 *
 * @return void
 */
public function listen($events, $listener)
{
    // ...
}

Next, this method using another method makeListener.
The makeListener() method is ready to use argument $listener as an array:

/**
 * Register an event listener with the dispatcher.
 *
 * @param \Closure|string $listener
 * @param bool            $wildcard
 *
 * @return \Closure
 */
public function makeListener($listener, $wildcard = false)
{
    if (is_string($listener)) {
        return $this->createClassListener($listener, $wildcard);
    }
    // ===================== see next line ====================
    if (is_array($listener) && isset($listener[0]) && is_string($listener[0])) {
        return $this->createClassListener($listener, $wildcard);
    }

    // ...
}

If we make event subscriber class like this:

<?php

namespace App\Listeners;

use App\Events\UserCreatedEvent;
use Illuminate\Events\Dispatcher;
use Illuminate\Support\Facades\Log;

class UserEventSubscriber
{
    public function handle(UserCreatedEvent $event)
    {
        Log::info($event->getTarget()->username);
    }

    public function subscribe(Dispatcher $dispatcher)
    {
        $dispatcher->listen(UserCreatedEvent::class, [$this, 'handle']); // using array as closure
    }
}

event listener works fine, but IDE shows Expected parameter of type '\Closure|string', 'array' provided in method listen.

I think it would be good to change the type hint for the $listener parameter from @param \Closure|string $listener to @param \Closure|array|string $listener.