== sanity-zero test 3a: truncate to a ZEROSTART boundary with an empty prev component ========================================================== 14:15:56 (1790705756) 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.172048 s, 6.1 MB/s 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.165697 s, 6.3 MB/s