Hi devs! We provide all source tarballs xz-compressed. Now, apparently, xz is quite a badly designed format (cf. http://lzip.nongnu.org/xz_inadequate.html ), and lzip provides the same compression, but an apparently distinctly more reasonable format.
I must admit that I personally neither heard about lzip, nor about xz being no good choice until today, but the current tar even supports it through the -- lzip switch. It seems to me that xz has more attention and popularity than it deserves, and lzip has less. Did you ever think about promoting lzip by using it for tarballs? Just in case the criticism about xz is justified. Cheers, Tobias