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parseNodes example

    protected function parseNodes(array $nodes): array
    {
        $values = [];

        foreach ($nodes as $name => $childNodes) {
            if (is_numeric($name) && \is_array($childNodes) && 1 === \count($childNodes)) {
                $options = current($childNodes);

                if (\is_array($options)) {
                    $options = $this->parseNodes($options);
                }

                $values[] = $this->newConstraint(key($childNodes), $options);
            } else {
                if (\is_array($childNodes)) {
                    $childNodes = $this->parseNodes($childNodes);
                }

                $values[$name] = $childNodes;
            }
        }