Customize the ID key in Restangular

When using Restangular, default behavior for PUT/PATCH/POST operations is to use the id of an item as the primary key. But what if you want to use a custom key like a slug or number instead?

// GET to /users
Users.getList().then(function(users) {
  var user = users[0]; // user === {id: 1, number: 123456, name: "Tonto"}
  user.name = "Gonto";
  // PUT to /users/1 <-- Here the id is used. But I'd like to use number to post to PUT to /users/123456
  user.put();
})

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