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2fe8cc4551
* Add missing leaf cache update when a leaf turns to a branch with two leaves (on merge) and vice versa (on delete) - this could lead to stale leaves being returned from the cache causing validation failures - it didn't happen because the leaf caches were not being used efficiently :) * Replace `seq` with `ArrayBuf` in `Hike` allowing it to become allocation-free - this PR also works around an inefficiency in nim in returning large types via a `var` parameter * Use the leaf cache instead of `getVtxRc` to fetch recent leaves - this makes the vertex cache more efficient at caching branches because fewer leaf requests pass through it.