fs.mkdir / fs.mkdirSync - mode parameter #1999

mode is ignored on windows, so it should be a optional parameter / have a default value

>node -v
v0.5.10

>node --eval "require('fs').mkdirSync('newDir')"

fs.js:361
  return binding.mkdir(path, modeNum(mode));
                 ^
TypeError: Bad argument
    at Object.mkdirSync (fs.js:361:18)
    at Object. (eval at  (eval:1:75))
    at Object. (eval:1:63)
    at Module._compile (module.js:432:26)
    at startup (node.js:84:14)
    at node.js:534:3