public function networkActive(bool $slugify = true): array
    {
        $cache_key = '_'.(int) $slugify; // Network wide.

        if (isset(static::$cache[__FUNCTION__][$cache_key])) {
            return static::$cache[__FUNCTION__][$cache_key];
        }
        if (!$this->Wp->is_multisite) { // Not applicable.
            return static::$cache[__FUNCTION__][$cache_key] = [];
        }
        $network_active = get_network_option(null, 'active_sitewide_plugins');
        $network_active = is_array($network_active) ? $network_active : [];
        $network_active = array_keys($network_active);

        if ($slugify) { // Slugs w/ basename keys.
            $network_active = $this->s::pluginSlugs($network_active);
        }
        return static::$cache[__FUNCTION__][$cache_key] = $network_active;
    }