This was done in a0a61c3e34873d02034cb804975ad2981328b5b4, but users typically install `nixUnstable` via `nix.package`, not by overlaying `pkgs.nix` directly.
This was done in a0a61c3e34873d02034cb804975ad2981328b5b4, but users typically install `nixUnstable` via `nix.package`, not by overlaying `pkgs.nix` directly.