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.
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第五条 当事人达成仲裁协议，一方向人民法院提起诉讼的，人民法院不予受理，但仲裁协议无效或者法律另有规定的除外。
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