彭博社指出，IBM 股价今年 2 月累计跌幅已达 27%，为至少 1968 年以来最差单月表现。
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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.