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Since 5.3.5beta, "xz --lzma2=mf=bt4,nice=2" works even though bt4 needs at least nice=4. It is rounded up internally by liblzma when needed. Fixes: 5cd9f0df78cc4f8a7807bf6104adea13034fbb45
Debug tools
-----------
This directory contains a few tiny programs that may be helpful when
debugging XZ Utils.
These tools are not meant to be installed. Often one needs to edit
the source code a little to make the programs do the wanted things.
If you don't know how these programs could help you, it is likely
that they really are useless to you.
These aren't intended to be used as example programs. They take some
shortcuts here and there, which correct programs should not do. Many
possible errors (especially I/O errors) are ignored. Don't report
bugs or send patches to fix this kind of bugs.