code: function openUid(dataDir, cb){
  	var fn = dataDir + '/minnow_data/server.uid'
  	exists(fn, function(exists){
  		if(exists){
  			fs.readFile(fn, 'utf8', function(err, uid){
  				if(err) throw err;
  				cb(uid)
  			})
  		}else{
  			var uid = seedrandom.uid()
  			fs.writeFileSync(fn, uid, 'utf8');
  			cb(uid)
  		}
  	})
  }
docs: /*
  var old = Array.prototype.indexOf
  var ccc = 0
  Array.prototype.indexOf = function(v){
  ++ccc
  if(ccc < 2000) return old.call(this, v)
  
  _.errout('TODO')
  }