Clone options in attach-link to prevent requestOptions changes from persisting

lib/proto/attach-link.js

@@ -7,6 +7,13 @@ var attrClick = "data-pjax-click-state"
 var attrKey = "data-pjax-keyup-state"
 
 var linkAction = function(el, event) {
+  // Since loadUrl modifies options and we may add our own modifications below,
+  // clone it so the changes don't persist
+  var options = clone(this.options);
+
+  // Initialize requestOptions since loadUrl expects it to be an object
+  options.requestOptions = {};
+
   // Don’t break browser special behavior on links (like page in new window)
   if (event.which > 1 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) {
     el.setAttribute(attrClick, "modifier")
@@ -51,10 +58,9 @@ var linkAction = function(el, event) {
     this.reload()
     return
   }
-  this.options.requestOptions = this.options.requestOptions || {};
+
   el.setAttribute(attrClick, "load")
 
-  var options = clone(this.options)
   options.triggerElement = el
   this.loadUrl(el.href, options)
 }