Thread IDs are Strings, not Integer

The THREAD resource (used to document Notifications) states that the ID is returned as an Integer, where in fact is returned as a String.

For instance, if I run

    curl -u [KEY]:x-oauth-basic https://api.github.com/notifications

I obtain the following result (truncated):

[
  {
    "id": "18765913",
    "unread": true,
    "reason": "mention",
    "updated_at": "2013-10-21T15:52:16Z",
    "last_read_at": null, ...
  }
]