For implementers, this promise-heavy design constrains optimization opportunities. The spec mandates specific promise resolution ordering, making it difficult to batch operations or skip unnecessary async boundaries without risking subtle compliance failures. There are many hidden internal optimizations that implementers do make but these can be complicated and difficult to get right.
先是见面礼，要不要带啤酒，两个人来回说了好一阵。带几瓶，什么价位的，都是当地的礼数。再是红包。阿爸数着那边有几个孩子。可轮到封钱时，又犹豫起来，一百，还是两百？在我们当地，一百、两百的差别，往往意味着关系远近的差别。
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Letter to the European institutions
“It is certainly not good for investment,” Smeaton tells me, with the wry understatement common to Scots. “Or for the U.S. consumer. They are paying higher prices.” MorphCostume’s outfits now cost 9% more, after Smeaton’s business was hit by a $3 million duty bill.