TestComplete javascript implementation of an Dictionary object bugged.

The code example they give for the new "getActiveXObject("Scripting.Dictionary")" implementation of a dictionary is as follows:

function DictionaryDemo()
{
  let d = getActiveXObject("Scripting.Dictionary");

  // Add keys and items.
  d.Add("a", "Alphabet");
  d.Add("b", "Book");
  d.Add("c", "Coffee");

  // Get the item by key.
  var s = d.Item("c");
  Log.Message(s);

  // Assign a new item to the same key.
  d.Item("c") = "Cookie";
  s = d.Item("c"); 
  Log.Message(s);

  // Assign a new key to the same item.
  d.Key("c") = "Co";

  // Remove second pair.
  d.Remove("b");
  if (d.Exists("b")) 
      Log.Message("The pair exists.") 
    else
      Log.Message("The pair does not exist.")
}

This code breaks in a couple of places. 

The line 'd.Item("c") = "Cookie";' gives the following error:

JavaScript runtime error.
ReferenceError: Invalid left-hand side in assignment.

The line 'd.Key("c") = "Co";' gives the following error:

JavaScript runtime error.

Error: Member not found.