TIL that you can compress .zip files with Zstandard (https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT compression method 93), and that libzip and 7-Zip support that.
https://libzip.org/news/release-1.8.0.html
https://github.com/ip7z/7zip/releases/tag/24.05
And Klaus Post's compress module has hooks, docs, and an example for how to produce and consume them with Go's archive/zip!
zstd package - github.com/klauspost/compress/zstd - Go Packages
Package zstd provides decompression of zstandard files.
(pkg.go.dev)
