if you create data object with an array item and pass it to jquery, jquery does not serialize it correctly:

var myData = new Object;

myData.somearray = new Array();

myData.somearray[0] = "val1";

myData.somearray[1] = "val2";

$.ajax(...data: myData...)

will result in a query string with only one value of somearray being passed in (somearray=val2) instead of what it should be (somearray[]=val1&somearray[]=val2).

The bug is in the param function. To fix this REPLACE:

If the value is an array then the key names need to be repeated

if ( a[j] && a[j].constructor == Array )

jQuery.each( a[j], function(){

s.push( encodeURIComponent(j) + "=" + encodeURIComponent( this ) );

});

WITH:

If the value is an array then the key names need to be repeated

if ( a[j] && a[j].constructor == Array )

jQuery.each( a[j], function(){

s.push( encodeURIComponent(j+"[]") + "=" + encodeURIComponent( this ) );

});