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Previously we had different meanings for the bitmask of vector IOps. That has now been unified to "bit set = final result, no more scribbling". Furthermore, the LFC read path scribbled on pages that were already read; that's probably not a good thing so that's been fixed too. In passing, the read path of LFC has been updated to read only the requested pages into the provided buffers, thus reducing the IO size of vectorized IOs. ## Problem ## Summary of changes