Laravel 5.2: Model->save() loses $options

I'm at a bit of a loss here. I have the following code:

// app/Post.php
<?php
namespace Korona;

use Illuminate\Database\Eloquent\Model;
use Cache;

class Post extends Model
{
    use Traits\Commentable;

    public function save(array $options = [])
    {
        Cache::forget('posts.' . $this->id);
        return parent::save($options);
    }
}

The trait is:

// app/Traits/Commentable.php
namespace Korona\Traits;

use Illuminate\Database\Eloquent\Model;
use Carbon\Carbon;

trait Commentable
{

    public function updateTouchedTimestamp()
    {
        $this->touched_at = Carbon::now();
        $this->save(['timestamps' => false]);
    }
}

Now, the $options array ('timestamps' => false) gets to the Post class alright. But when I output $options in Illuminate\Database\Eloquent\Model::save(), the array is empty. I don't know why the $options array gets lost on the way from Post's parent::save($options) to the base class's save($options) method.

via Chebli Mohamed