Submit array param with jQuery ajax/load

public ActionResult DoSomething(string[] arr, bool someBool, int someInt) { }

trying to call the above method from jQuery:

var test = [];
test.push('dog');
test.push('cat');

$container.load('MyController/DoSomething',
                { 'arr[]': test, 'someBool': true, 'someInt': 1 },
                function(response, status, xhr) {
                    // ...
                });

the array paramater is null, other params are fine. What am I doing wrong?

Chrome developer tools shows form data being submitted as

arr%5B%5D%5B%5D:dog
arr%5B%5D%5B%5D:cat
someBool:true
someInt:1

not sure whats going on there but doesn't look right to me