pub const NAR_REF_PREFIX: &'static str;Expand description
Key-space prefix owning every reverse edge.
Deliberately a sibling of nar/ rather than a child: a Nix client only ever
fetches nix-cache-info, <hash>.narinfo and the exact URL: a narinfo
advertises, so an extra top-level directory is invisible to it, while a child
of nar/ would sit in the namespace a NAR key is drawn from.