This change was in response to a custom request. They still have a factor of 4 before reaching the old upper limit, but asked for additional headroom. Note that the 281 TB limit is only reachable when using a 65536-byte page size. For the more common 4096 page size, the size limit is raised from 8.8 TB up to 17.5 TB by this enhancement. We do not believe further size increases are possible without an incompatible file format change.