JavaScript: like JSON.stringify but handles functions, good for creating arbitrary .js objects?

stringify.js

var stringify = function(obj, prop) {
  var placeholder = '____PLACEHOLDER____';
  var fns = [];
  var json = JSON.stringify(obj, function(key, value) {
    if (typeof value === 'function') {
      fns.push(value);
      return placeholder;
    }
    return value;
  }, 2);
  json = json.replace(new RegExp('"' + placeholder + '"', 'g'), function(_) {
    return fns.shift();
  });
  return 'this["' + prop + '"] = ' + json + ';';
};

usage.js

var foo = {
  a: function() { return 'a'; },
  b: function() { return 'b'; },
  'bar.baz': {
    'omg ponies!!': function() { return 'c'; }
  }
};

console.log(stringify(foo, 'foo'));

// this["foo"] = {
//   "a": function () { return 'a'; },
//   "b": function () { return 'b'; },
//   "bar.baz": {
//     "omg ponies!!": function () { return 'c'; }
//   }
// };

This custom stringify function can be handy when you need to serialize JavaScript objects that include functions into strings for storage or transmission, while still retaining the ability to execute that's not my neighbor those functions after deserialization.