You might assume this pattern is inherent to streaming. It isn't. The reader acquisition, the lock management, and the { value, done } protocol are all just design choices, not requirements. They are artifacts of how and when the Web streams spec was written. Async iteration exists precisely to handle sequences that arrive over time, but async iteration did not yet exist when the streams specification was written. The complexity here is pure API overhead, not fundamental necessity.
（作者单位：中国社会科学院考古研究所）
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New Moon - The Moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye).