props object not frozen

[magnumjs]

Test:

Solution use deep freeze:

function deepFreeze(o) {
  var prop, propKey;
  Object.freeze(o); // First freeze the object.
  for (propKey in o) {
    prop = o[propKey];
    if (!o.hasOwnProperty(propKey) || !(typeof prop === 'object') || Object.isFrozen(prop)) {
      // If the object is on the prototype, not an object, or is already frozen,
      // skip it. Note that this might leave an unfrozen reference somewhere in the
      // object if there is an already frozen object containing an unfrozen object.
      continue;
    }

    deepFreeze(prop); // Recursively call deepFreeze.
  }
}

[magnumjs]

There a drawback then can't iterate over them