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.
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诉求的表达很繁复，也很多样。这就需要大人时刻准备着，说对了要表扬，说错了要纠正。
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