Hooking into model events causes no slug to be created about eloquent-sluggable HOT 3 CLOSED

<?php
class Fruit extends Eloquent {
    public function boot() {
        parent::boot();
        static::saving(function($model) {
            return $model->arbitraryFunction();
        });
    }

    public function arbitraryFunction() {
        // do stuff
    }

    // ....
}
?>

<?php
use Cviebrock\EloquentSluggable\SluggableInterface;
use Cviebrock\EloquentSluggable\SluggableTrait;

class Orange extends Fruit implements SluggableInterface {
    use SluggableTrait;
    protected $sluggable = [
        'build_from' => 'name',
        'save_to' => 'slug'
    ];

    // .....
}