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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.
。同城约会对此有专业解读
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新一代X5除保留40 sDrive后驱入门版外，还将新增纯电iX5 60 xDrive版本。