From the maintainer Li Haoyi: I'm putting a 500USD bounty on this issue, payable by bank transfer on a merged PR fixing this.

See https://github.com/orgs/com-lihaoyi/discussions/6 for other bounties and the terms and conditions that bounties operate under

@kiendang hit some issues using os.zip in Mill (com-lihaoyi/mill#4503), some of which are permissions related. It seems that since 2019 the JDK's zip file APIs should be able to support permissions (https://bugs.java.com/bugdatabase/view_bug?bug_id=8213031), so we should make sure OS-Lib takes advantage to preserve permissions when zipping and unzipping files and folders