Final Hurdle hintHits the slopes.
const output = Stream.pull(source, toUpperCase);
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After a recovery ship lifted it out of the water, the astronauts beamed and waved as they were helped out of the hatch, along with fellow crew members astronaut Nick Hague and cosmonaut Aleksandr Gorbunov.
// Create a push stream
缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）