It doesn’t hurt to lurk first before weighing in, partly because on some chat platforms new members can’t see what was posted before they joined.
Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it – only the code that is actually holding the reader can.
，这一点在91视频中也有详细论述
Now let’s revisit the selector wildcard examples from the beginning using BPatterns.
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// 当前元素入栈：成为「左侧元素」的候选更大值（易错点4：别漏写这一步）