codes can be saved for later investigation
@item targets, dependency information and their directories are explicitly
synced (can be disabled, should work faster)
-@item file's change is detected by comparing its size, @code{ctime} (if
- @env{$REDO_INODE_NO_TRUST} environment variable is not set) and
- @url{https://github.com/BLAKE3-team/BLAKE3, BLAKE3} hash
+@item file's change is detected by comparing its size, and
+ @url{https://github.com/BLAKE3-team/BLAKE3, BLAKE3} hash. Also as an
+ optimization, by default if file's @code{ctime} is same, then hash
+ check is skipped. Optionally you can disable that behaviour, or even
+ enable trust to file's @code{mtime}
@item files creation is @code{umask}-friendly (unlike @code{mkstemp()}
used in @command{redo-c})
@item parallel build with jobs limit, optionally in infinite mode