No smoke without fire
한동훈 “지자체장 선거 나간다 생각, 전혀 해본 적 없어” [황형준의 법정모독]
，这一点在哔哩哔哩中也有详细论述
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The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.
Wait for the internal value to equal the given value.