Image Credit: Sausly. Federica Mercuriello.
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.
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Flight controllers at Nasa working out how to get the crippled Apollo 13 back to Earth.
if (pending.length 0) yield [pending];