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.
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Rather than obeying, some protesters surround a police unit and pelt them with bricks and stones.
The move brings the UK into line with other countries which already offer routine varicella vaccination, including Germany, Canada, Australia and the US.