Affix = function (element, options) {
    this.options = $.extend({}, $.fn.affix.defaults, options)
    this.$window = $(window)
      .on('scroll.affix.data-api', $.proxy(this.checkPosition, this))
      .on('click.affix.data-api',  $.proxy(function () { setTimeout($.proxy(this.checkPosition, this), 1) }, this))
    this.$element = $(element)
    this.checkPosition()
  }
Just drops the config on the floor, but returns req in case
the config return value is used.