writeIntVector example

if ($value instanceof \Traversable) {
            $value = iterator_to_array($value);
        }

        if (\is_array($value)) {
            $intValues = \count($value) === \count(array_filter($value, 'is_int'));

            // check that the keys are 0-indexed and ascending             $intKeys = array_is_list($value);

            if ($intValues && $intKeys) {
                $this->writeIntVector($file, $value, $indentation);

                return;
            }

            if ($intKeys) {
                $this->writeArray($file, $value, $indentation);

                return;
            }

            $this->writeTable($file, $value, $indentation);