Hmm, so we have zip -> zopfli -> lockfree-object-pool which is BSL-1.0 (the Boost Software License, not the MariaDB/Hashicorp one). But the rustc check only allows for BSL crates dual-licensed as Apache-2.0: "BSL is not acceptable, but we use it under Apache-2.0".

So if BSL and Apache-2.0 are incompatible, maybe we should raise this with zopfli.

I pushed a commit to disable zopfli. We only use zip in xtask dist, it's not going to make a difference.