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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.
，这一点在heLLoword翻译官方下载中也有详细论述
（一）按照纳税人最近时期销售同类货物、服务、无形资产或者不动产的平均价格确定；，更多细节参见Line官方版本下载
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