[&:first-child]:overflow-hidden [&:first-child]:max-h-full"
Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
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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.
"I have to walk two hours a day to come into town to get food," he says, preferring to find shelter outside of the city centre where he feels safer, sleeping in a one-man tent under a bridge.