src/Valkyrja/Http/NativeResponse.php
public function isClientError(): bool
    {
        return $this->statusCode >= StatusCode::BAD_REQUEST
            && $this->statusCode < StatusCode::INTERNAL_SERVER_ERROR;
    }
public function isClientError(): bool
    {
        return $this->statusCode >= StatusCode::BAD_REQUEST
            && $this->statusCode < StatusCode::INTERNAL_SERVER_ERROR;
    }
Is there a client error?

@return bool