MVC 3 json post array workaround

Ajax-posting a JSON object containing arrays using jQuery work fine in PHP, but since ASP.NET expects the array to be posted with indeces a tiny workaround is required. Consider the following example:

var jsonData = { foo: 0, bar: [1, 2] };
$.post("/post-url", postData, function () {});

This will cause the post data to look like

foo=0
bar[]=1
bar[]=2

PHP acceps this, but ASP.NET requires the post data to be

foo=0
bar[0]=1
bar[1]=2

Here’s a workaround. Run it before $.post.