The binaries you refer to as source of truth are a paid product (not sure if the trial version, which requires filling out a form that's currently not loading, includes all options, or how honest it is to use that to make an alternative to their software, or if the terms allow that) and don't seem to run on my operating system. I guess I could buy me a Windows license and read the pkzip EULA to see if you're allowed to use it for making a clone, but I figured the two decoders (that don't always agree with each other) I had on hand would do. If they agree about a field, it's good enough (and decoders can expect that unspecced fields are garbage)