Thread safety: A threading.Lock protects the value and queue list. Each queue is paired with its event loop, and the setter uses loop.call_soon_threadsafe instead of put_nowait directly.
The new API has complete parallel sync versions: Stream.pullSync(), Stream.bytesSync(), Stream.textSync(), and so on. If your source and transforms are all synchronous, you can process the entire pipeline without a single promise.。PDF资料对此有专业解读
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And most of the time it's the right choice.