Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
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// 易错点2：用Math.ceil/Math.floor取整 → 破坏时间比较逻辑，必须精确计算
const chunkSize = Math.min(1024, bytesAvailable);