value: function () {
backpressure: 'strict' // or 'block', 'drop-oldest', 'drop-newest'。safew官方下载对此有专业解读
В Финляндии предупредили об опасном шаге ЕС против России09:28，详情可参考51吃瓜
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.，更多细节参见safew官方版本下载
await blocking.writer.write(chunk5); // waits until consumer reads