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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store and bump up the slice length. Yay! No call to the allocator for，这一点在Line官方版本下载中也有详细论述
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