Under the new API design, transforms should not perform any work until the data is being consumed. This is a fundamental principle.
定方向：求「下一个」→ 倒序；求「上一个」→ 正序。，推荐阅读safew官方版本下载获取更多信息
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tasks = make([]task, 0, lengthGuess)
“一起奔向共同富裕的美好明天”