Deserialized query params are not available in model hooks

dates.js

// a controller which has a date property which defaults to today, serialized it to query params as a string

FoosController = Ember.Route.extend({
  queryParams: ["date:dateStr"],

  date: function(){
    return moment()
  }.property(),

  dateStr: function(k, value) {
    if (arguments.length == 2) {
      this.set("date", moment(value, "YYYY-MM-DD"))
      return value
    } else {
      return this.get("date").format("YYYY-MM-DD")
    }
  }.property("date")
})

// now we have the route, but we only have the pre-deserialized date here so I've got to duplicate
// the deserialization & defaults

FoosRoute = Ember.Route.extend({

  // here be duplication, I don't have access to the controller here yet so have to repeat myself
  model: function(params) {
    var dateStr = params.date, date
    if (dateStr) {
      date = moment(dateStr, "YYYY-MM-DD")
    } else {
      date = moment()
    }

    return this.store.find("foos", {
      start: date.startOf("week"),
      end:   date.endOf("week")
    })
  },

  setupController: function(controller, model) {
    // I now have the controller with the date set, but it's too late to be useful for finding

    return this._super(controller, model)
  }
})