STINNER Victor <vstin...@redhat.com> added the comment:
man lzma:
--fast
--best These are somewhat misleading aliases for -0 and -9, respec‐
tively. These are provided only for backwards compatibility
with LZMA Utils. Avoid using these options.
man bzip2:
-1 (or --fast) to -9 (or --best)
Set the block size to 100 k, 200 k .. 900 k when compressing.
Has no effect when decompressing. See MEMORY MANAGEMENT below.
The --fast and --best aliases are primarily for GNU gzip compat‐
ibility. In particular, --fast doesn't make things signifi‐
cantly faster. And --best merely selects the default behaviour.
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<https://bugs.python.org/issue34969>
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