Not all streaming workloads involve I/O. When your source is in-memory and your transforms are pure functions, async machinery adds overhead without benefit. You're paying for coordination of "waiting" that adds no benefit.
[ any isNil ifTrue: anyBlock ] bpattern，这一点在safew官方版本下载中也有详细论述
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Indya Moore and Luka Sabbat are a revelation as twins. Across all three vignettes, Jarmusch laces shared elements, like red clothing, a Rolex watch, clumsy toasts with nonalcoholic beverages, images of young skateboarders rolling by carefree and in slow motion, and some iteration of the idiom "Bob's your uncle." But in this chapter, he breaks the pattern of a family of three. In the Paris-set "Sister Brother," Indya Moore and Luka Sabbat play twins surveying what remains of their childhood home in the wake of their parents' deaths.