Use jdalton's shorter sequence for the chars.

src/ajax.js

@@ -45,7 +45,7 @@ var r20 = /%20/g,
 	ajaxLocParts,
 	
 	// Avoid comment-prolog char sequence (#10098); must appease lint and evade compression
-	allTypes = "*/".concat("*");
+	allTypes = ["*/"] + ["*"];
 
 // #8138, IE may throw an exception when accessing
 // a field from window.location if document.domain has been set