Is it possible to write null instead of [] for empty attribute containers?

[MrMage]

When I save a new entity to the database, as long as I never touch the SchemalessAttributes property, it will get written as null to the database. But as soon as I touch the property, it will get written as [] to the database; a mere $entity->property_bag call is sufficient without actually doing anything with the property. I would like to have it always written as null to the database, even when the SchemalessAttributes field has been instantiate (provided it is empty, of course).

I understand this might not be built in; if I have to implement this myself, would it be possible to simply subclass Casts\SchemalessAttributes and override its set method to return null instead of [] when the value is empty? Or is there a better way to do this? Or would that maybe have other unintended side effects?

[MrMage]

FYI, I am working around this with the following subclass now:

<?php

declare(strict_types=1);

namespace App\Casts;

use Spatie\SchemalessAttributes\Casts\SchemalessAttributes as CastsSchemalessAttributes;

class SchemalessAttributes extends CastsSchemalessAttributes
{
    public function set($model, $key, $value, $attributes)
    {
        $result = parent::set($model, $key, $value, $attributes);
        if ($result === '[]') {
            return null;
        }

        return $result;
    }
}