I've written a very naive pristine-xz. I don't have a way to detect compression level, but it can try the most common ones. -6 and -9 are the only levels that seem used, but the whole list could be tried at the expense of being slow to fail and perhaps using a lot of memory.
Doing so, I'm able to reproduce 70% of the small corpus of xz files now present in Debian. Currently trying with --extreme to see if that gets any more. This is really a smaller success rate than I'm fully comfortable with. -- see shy jo
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