compaction_readahead_size doesn't work when it is larger than max_sectors_kb

From tests I run with RocksDB 8.7 and 8.8 what I see with rareq-sz from iostat is many small reads (block sized) from compaction when compaction_readahead_size is larger than /sys/block/$device/queue/max_sectors_kb. Reducing compaction_readahead_size resolves the problem. I assume it should be smaller than max_sectors_kb+rocksdb_block_size or some other fudge factor because the readahead requested can be slightly larger than compaction_readahead_size.