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if (offset = totalBytes) {
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Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.
The US has been accused of “shameless exploitation” over a health financing agreement with Zambia worth more than $1bn (£740m), amid warnings that the country is getting a raw deal from the Trump administration.