One thing I haven't figured out from either today's post or Yann's blog is whether Zstandard is switching between huff0 and FSE depending on compression level or is it somehow using both together? Also the post says its both OoO friendly and multi-core friendly but the speed benchmarks are those in a single core context or multi-core? Does only the format/algorithm multi-core friendly or the standard cli can run multi-threaded.