@icedquinn @iska @Reiddragon @lispi314 I hold the view that ZStd is too complicated to count as a real "standard"; the zstd library is an order of magnitude larger than libdeflate, so the algorithm is very difficult to independently re-implement.
Therefore I'm very happy to learn about ROLZ! I may want to try re-implementing that.
I wonder if retrofitting ROLZ in place of LZ in DEFLATE would produce even better results... and, to speed things up, replace the one or two Huffman stages with FSE, which is after all the primary innovation enabling ZStd.