I.e. tag pages that needed to be read in synchronously with that fact (or reversely ones that were prefetchable).
That's somewhat similar to the old idea of @petervgeoghegan (IIRC) to just always keep inner index pages around more aggressively.
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But I hope it'd be more generic (i.e. also keep randomly accessed table pages around) and resilient (doesn't trigger due to vacuum scanning the index).
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