Fix node PHPDoc type hints

[herndlm]

Those 3 methods are also called with properties that are determined more dynamically like e.g.

foreach ($node->getSubNodeNames() as $subNodeName) {
    $subNode = $node->{$subNodeName};
    $this->processNodes($subNode, $nodeCallback, $endNodeCallback);
}

and $subNode can be null here for e.g. $node->stmts.

noticed this when trying to enforce native union type hints for params return types via phpcs. btw what is the reason this is not done yet? BC for public methods I suppose?

[herndlm]

I do wonder though why PHPStan did not report this. Looks like the type is mixed, implicit mixed I suppose?

[ondrejmirtes]

Thank you! :) Yeah, PHPStan is on level 8, and you can't expect any useful typechecking with $node->{$subNodeName} :)