public function getErrors()
    {
        if ($this->errors === null) {
            if ($errors = $this['errors']) {
                foreach ($errors as $key => $error) {
                    $errors[$key] = $this->shapeFor($error);
                }
                $this->errors = $errors;
            } else {
                $this->errors = [];
            }
        }

        return $this->errors;
    }