// console.log(spanner.next(75)); // 输出4（正确）
* 核心思路：倒序遍历 + 单调索引栈（仅存索引，通过索引取温度），计算下一个高温的间隔天数
，更多细节参见safew官方版本下载
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If the transform's transform() operation is synchronous and always enqueues output immediately, it never signals backpressure back to the writable side even when the downstream consumer is slow. This is a consequence of the spec design that many developers completely overlook. In browsers, where there's only a single user and typically only a small number of stream pipelines active at any given time, this type of foot gun is often of no consequence, but it has a major impact on server-side or edge performance in runtimes that serve thousands of concurrent requests.