src/Parser/Parser.php
protected function parseMapEntry($label, Node $val): array
    {
        return [
            \is_array($label) ? $label[0]->value : $label->value,
            $val
        ];
    }
protected function parseMapEntry($label, Node $val): array
    {
        return [
            \is_array($label) ? $label[0]->value : $label->value,
            $val
        ];
    }
MapEntry ::= ( T_LABEL | ( QuotedString ':' ) ) Statement