anchor.diff:    "date": "2015-01-15T16:54:10+01:00",
     "path": "/nix/store/n7gb0z26sl7dzdyy3bx1y3cz3npsna7d-lua-luaepnf",
     "sha256": "1lvsi3fklhvz671jgg0iqn0xbkzn9qjcbf2ks41xxjz3lapjr6c9",
  +  "fetchLFS": false,
     "fetchSubmodules": true,
     "deepClone": false,
     "leaveDotGit": false
  
positive.code:   "date": "2021-04-09T17:11:35+01:00",
    "path": "/nix/store/zzd1xj4r0iy3srs2hgv4mlm6wflmk24x-lua-resty-http",
    "sha256": "1whwn2fwm8c9jda4z1sb5636sfy4pfgjdxw0grcgmf6451xi57nw",
    "fetchSubmodules": true,
    "deepClone": false,
    "leaveDotGit": false
  
negative.code:   pname = "lrexlib-posix";
    version = "2.9.1-1";
    knownRockspec = (fetchurl {
      url    = "https://luafr.org/luarocks/lrexlib-posix-2.9.1-1.rockspec";
      sha256 = "1zxrx9yifm9ry4wbjgv86rlvq3ff6qivldvib3ha4767azla0j0r";
    }).outPath;
    src = fetchgit ( removeAttrs (builtins.fromJSON ''{
  