RemoveData works with lowercase key only

[dizel3d]

The test is failed when elem.RemoveData("Q") but succeed with elem.RemoveData("q"):

var elem = CQ.Create("<div>");
elem.Data("Q", "data");
Debug.Assert(elem.DataRaw("Q") == "data");
Debug.Assert(elem.DataRaw("Q") == elem.DataRaw("q"));
elem.RemoveData("Q"); //elem.RemoveData("q");
Debug.Assert(elem.DataRaw("Q") == null); //failed!

Version 1.3.4 from NuGet.