A block has a storage capacity, and once it's used up, it can be closed and linked to a previously served block.
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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He says the "premium line" he is working on will sit alongside the brand's more affordable options and be for those who would "rather spend a bit more money and want something higher quality".，这一点在同城约会中也有详细论述