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This prevents runaway O(n^2) behavior on devices with extremely large block sizes (NAND, bs=~128KiB - ~1MiB). The whole point of shrubs is to avoid this O(n^2) runaway when inline files become necessarily large. Setting FRAGMENT_SIZE to a factor of the BLOCK_SIZE humorously defeats this. The 512 byte cutoff is somewhat arbitrary, it's the natural BLOCK_SIZE/8 FRAGMENT_SIZE on most NOR flash (bs=4096), but it's probably worth tuning based on actual device performance.