Influence Flower (What are Influence Flowers?)
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It surveyed around 5,000 people and then followed 50 couples in forensic, sometimes intrusive detail, combining statistics with diaries, interviews and "emotion maps" of what happened in the home.
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.