FYI Eloquent accessors are called with param null when a relation is instantiated

[macropay-solutions]

Eloquent accessors for columns used in relations are called with param null when a relation is instantiated so, they must be defined with ?string param and return type even if the column is not nullable in DB.

    public function getColAttribute(?string $value): ?string
    {
        return \is_string($value) ? \strtolower($value) : null;
    }