Is it possible to add a compression level along with the compression method used?
zlib, lzo and lzma offer several different compression levels (1-9). I find it useful to be able to
decide which one to use. For example, lzo levels 7-9 are quite useless because they are both
slower and less efficient than gzip, gzip level 6 is only slightly less efficient than level 9 but
much faster, and lzma seems to be best at levels 4 and 9...
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