== sanity-zero test 3a: truncate to a ZEROSTART boundary with an empty prev component ========================================================== 14:24:46 (1790706286) 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.119693 s, 8.8 MB/s 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.183241 s, 5.7 MB/s