[bug] Replace function in DefaultProviders is not working for first element

[margatampu]

I can't use replace function provided by framework/src/Illuminate/Support
/DefaultProviders.php when I use it in my config/app.php since I need to replace first provider when have key '0'.

// config/app.php
...
'providers' => ServiceProvider::defaultProviders()->merge([
        /*
         * Package Service Providers...
         */

        /*
         * Application Service Providers...
         */
        App\Providers\AppServiceProvider::class,
        App\Providers\AuthServiceProvider::class,
        // App\Providers\BroadcastServiceProvider::class,
        App\Providers\EventServiceProvider::class,
        App\Providers\RouteServiceProvider::class,
    ])->replace([
        //  Replace method doesnt work on key = 0
        \Illuminate\Auth\AuthServiceProvider::class => \App\Services\Illuminate\Auth\AuthServiceProvider::class,
    ])->toArray(),
...

// DefaultProvider.php
...
/**
     * Replace the given providers with other providers.
     *
     * @param  array  $items
     * @return static
     */
    public function replace(array $replacements)
    {
        $current = collect($this->providers);

        foreach ($replacements as $from => $to) {
            $key = $current->search($from);

            $current = $key ? $current->replace([$key => $to]) : $current;
        }

        return new static($current->values()->toArray());
    }
...