Note: `--long` mode will be automatically activated if chainLog < fileLog
(fileLog being the windowLog required to cover the whole file). You
can also manually force it.
- Node: for all levels, you can use --patch-from in --single-thread mode
+ Note: for all levels, you can use --patch-from in --single-thread mode
to improve compression ratio at the cost of speed
Note: for level 19, you can get increased compression ratio at the cost
of speed by specifying `--zstd=targetLength=` to be something large