[Config] ArrayNode::addChild() - $node->getName() can't be 0

Node name (array key) cannot be 0

# bundle.yml
bundle:
    0: # won't work
        something: else
    1:
        this: works

$name = $node->getName();
if (empty($name)) { // problem is here
    throw new \InvalidArgumentException('Child nodes must be named.');
}

Easy fix will be something like if (!strlen($name)).
Thanks!

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