The Web streams spec requires promise creation at numerous points, often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.
Scroll to load interactive demo
，这一点在Line官方版本下载中也有详细论述
在寻亲之外，许冰煌如此理解杜耀豪此行的意义：“个人在宏大的家族离散历史中，个体在后离散时代，去处理长时间、复杂的家族历史遗产等议题。”
const posToTime = new Map(); // 映射：位置 → 到达终点的时间