unexpected address family 17

[internetionals]

When calling recvfrom on a socket(AddressFamily::Packet, SockType::Datagram, ...) socket I receive this panic from inside nix::sys::socket::sockaddr_storage_to_addr:

thread 'main' panicked at 'unexpected address family 17', /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/nix-0.19.0/src/sys/socket/mod.rs:1744:15
stack backtrace:
   0: rust_begin_unwind
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:475
   1: std::panicking::begin_panic_fmt
             at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:429
   2: nix::sys::socket::sockaddr_storage_to_addr
             at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/nix-0.19.0/src/sys/socket/mod.rs:1744
   3: nix::sys::socket::recvfrom
             at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/nix-0.19.0/src/sys/socket/mod.rs:1540

It appears that this function doesn't have a handler for this address family, even though it appears supported on all other fronts.

The panic also made it impossible to handle this in some other way, but apart from adding a SockAddr::Unknown, or hijacking some Errno, I don't see any option that would make sense API wise.