Comment by codys

Rust has an RFC about some of the conventions for the Fd conversions. https://rust-lang.github.io/rfcs/3128-io-safety.html

It's unfortunate they did not extend marking the OwnedFd conversions as unsafe due to the focus in the RFC on a single class of unsafety in Fds instead of having a recognition that there are other issues with arbitrary Fd conversions.