pjax/lib/polyfills/Function.prototype.bind.js

if (!Function.prototype.bind) {
  Function.prototype.bind = function(oThis) {
    if (typeof this !== "function") {
      // closest thing possible to the ECMAScript 5 internal IsCallable function
      throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable")
    }

    var aArgs = Array.prototype.slice.call(arguments, 1)
    var that = this
    var Fnoop = function() {}
    var fBound = function() {
      return that.apply(this instanceof Fnoop && oThis ? this : oThis, aArgs.concat(Array.prototype.slice.call(arguments)))
    }

    Fnoop.prototype = this.prototype
    fBound.prototype = new Fnoop()

    return fBound
  }
}