DataCaster not working

This happens in the Model. I get the data in the form of an entity.

PHP Code:

final class SettingsParameter extends Entity
{
    private ?int $id = null;
    private string $parameter;
    private string $value;
    private ?string $description;
    protected $casts = [
        'id'          => '?int',
        'parameter'  => 'string',
        'value'      => 'string',
        'description' => '?string',
    ];

    public function getId(): ?int
    {
        return $this->id;
    } 


For getId() I can't get ?int
So I need to move the $cast parameter to the Model? Can this affect the entity in the future?

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