Well, it is every version of RAR. Documenting the quirks of rar 1.4, 1.5, 2.0, 2.9, 3.0, 4.0, 5.0 and 7.0, multiple compression strategies, PPMd, RARVM, compression levels, encryption, multi volume support, a huge test corpus, round trips for compatibility... The spec docs are linked.
Your probably right I should read the spec but I've worked with so many brillant engineers and I am still pretty young so their must be even more. I just think the overselling of complexity is usually what makes things enterprise grade :) (if you know you know)
