Item -> item_category - Validation error [VALUE_INVALID] about php-ga4 HOT 3 CLOSED

final class Item extends \AlexWestergaard\PhpGa4\Item {
	protected null|string $weight;
	protected null|string $item_category2;
	protected null|string $item_category3;
	protected null|string $item_category4;
	protected null|string $item_category5;

	public function setWeight( string $weight ) {
		$this->weight = $weight;
		return $this;
	}

	public function addItemCategories( array $categories ) {
		$index = '';
		if ( count( $categories ) > 0 ) {
			foreach ( $categories as $category ) {
				$param                     = 'item_category' . $index;
				$this->$param              = $category;
				$index ? $index++ : $index = 2;
				// GA supports up to 5 categories.
				if ( $index >= 5 ) {
						break;
				}
			}
		}
		return $this;
	}

	public function getParams(): array {
		$params = parent::getParams();

		$custom_params = array(
			'item_category2',
			'item_category3',
			'item_category4',
			'item_category5',
			'weight',
		);

		return array_merge( $params, $custom_params );
	}
}