private function get_names()
    {
        $names = [
            'name' => $this->get_name(),
        ];

        if ($this->plural !== null) {
            $names['plural'] = $this->plural;
        }

        if ($this->singular !== null) {
            $names['singular'] = $this->singular;
        }

        if ($this->slug !== null) {
            $names['slug'] = $this->slug;
        }

        return $names;
    }