Mongoose objects cause infinite recursion in clone method

[sansmischevia]

This deep clone method may cause infinite recursion on Mongoose objects in version 2.7.1 of mongoose when trying to log the mongoose object as meta. Maybe prevent this by adding a maximum depth to this function?

common.clone = function (obj, lvl) {
  lvl = lvl || 1;
  var clone = {};
  if (lvl > MAX_DEPTH) {
    return clone;
  }

  for (var i in obj) {
    clone[i] = obj[i] instanceof Object ? common.clone(obj[i], lvl+1) : obj[i];
  }

  return clone;
};

[mattcasey]

this one's very annoying, however.. a 'fix' for apps using the log function is to call .toObject() on the mongoose instance. that would also work inside of here.. if toObject exists, call that