Many systems and monoliths that have been built a long time ago were also modular, but their modules were mostly based on the classical Three-tier Architecture. Such a setup has a low testability, because the Business layer required the Data Access Layer (DAL) to operate even in unit tests (or you had to do a code surgery to find seams, if there were ones).
This was a point also made by former US Secretary of State John Kerry.
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let future1 = pin!(foo());
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nums := []int{1, 2, 3}。关于这个话题，体育直播提供了深入分析