The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
// console.log(spanner.next(100)); // 输出1（正确）。一键获取谷歌浏览器下载对此有专业解读
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// 逻辑：只要左侧元素最小值，说明该元素需纳入无序区间，左边界左移。谷歌浏览器【最新下载地址】对此有专业解读