For transforms that need cleanup on abort, add an abort handler:
Жители Санкт-Петербурга устроили «крысогон»17:52
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这些看起来是搬箱子，背后其实是一整套复杂的任务规划与执行。
The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.
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