Documenting a JsonValueProviderFactory Gotcha (MVC 3 meet Dictionary)

HomeController.cs

        //...

        [HttpPost]
        public ActionResult PostDictionary(Dictionary<string, string> myDictionary)
        {
            return Json(myDictionary);
        }

        //...

HomeControllerWorkaround.cs

        //...

        [HttpPost]
        public ActionResult PostDictionary(string myDictionary)
        {
            var actualDictionary = new System.Web.Script.Serialization.JavaScriptSerializer()
                .Deserialize<Dictionary<string, string>>(myDictionary);

            return Json(actualDictionary);
        }

        //...

PostDictionaryTest.js

        $.ajax("PostDictionary", {
            type: "POST",
            contentType: "application/json",
            data: JSON.stringify({
                myDictionary: {
                    "This": "is",
                    "a": "dictionary"
                }
            }),
            success: function (result) {
                alert(JSON.stringify(result));
            }
        });

PostDictionaryTestWorkaround.js

        $.ajax("PostDictionary", {
            type: "POST",
            contentType: "application/json",
            data: JSON.stringify({
                myDictionary: JSON.stringify({ //Note the deliberate double JSON.stringify
                    "This": "is",
                    "a": "dictionary"
                })
            }),
            success: function (result) {
                alert(JSON.stringify(result));
            }
        });