The design of Web streams predates async iteration in JavaScript. The for await...of syntax didn't land until ES2018, two years after the Streams Standard was initially finalized. This timing meant the API couldn't initially leverage what would eventually become the idiomatic way to consume asynchronous sequences in JavaScript. Instead, the spec introduced its own reader/writer acquisition model, and that decision rippled through every aspect of the API.
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Nasa said he had "turned a potential tragedy into a success" after an attempt to land on the Moon was aborted because of an explosion onboard the spacecraft while it was hundreds of thousands of miles from Earth.