public function bySlug(string $slug, bool $no_cache = false)
    {
        $slug = (string) $slug;

        if (!($slug = (string) $slug)) {
            return null; // Not possible.
        } elseif (!($product_id = $this->idBySlug($slug, $no_cache))) {
            return null; // Not possible.
        } elseif (!($WC_Product = wc_get_product($product_id))) {
            return null; // Not possible.
        } elseif (!$WC_Product->exists()) {
            return null; // Not possible.
        }
        return $WC_Product;
    }