== sanity-zero test 3a: truncate to a ZEROSTART boundary with an empty prev component ========================================================== 14:26:34 (1790706394) 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.35937 s, 2.9 MB/s 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.2179 s, 4.8 MB/s