final: prev:
let
  callPackage = prev.lib.callPackageWith { pkgs = prev; };
in
{
  lib = {
    fetchers = prev.fetchers // {
      sshKnownHosts = callPackage ./fetchers/sshKnownHosts { };
    };

    runtime = {
      merge = {
        keyValue = callPackage ./runtime/merge/keyValue { };
      };
    };
  };
}