public function getFailures(bool $skipEmptyValues = false) : array
    {
        if ($this->failures) {
            if ($skipEmptyValues) {
                $net = [];
                foreach ($this->failures as $key => $val) {
                    if ($val) {
                        $net[$key] = $val;
                    }
                }
                return $net;
            }
            return $this->failures;
        }
        return [];
    }