///var a = new Dictionary()
///a["key"] = 5
///a["key"]
5
///a["key"] = 6
///var key2 = new Test()
///a[key2] = 23
///var key3 = new Test()
///a[key3] = "Key3 True Value"
///a["key3"] = "Key3 False Value"
///var key4 = {"toString": function() { return "key4"; }}
///a[key4] = "Key4 True Value"
///a["key4"] = "Key4 False Value"
///a[13] = "i've been found!"
///a["13"] = "no I haven't"
///a[1.123] = "this violates Rust!"
///a["1.123"] = "this is perfectly acceptable"
///a[undefined] = "oh no"
///a["undefined"] = "uh huh..."
///a[null] = "oh YES!"
///a["null"] = "yeah sure"
///a[true] = "true"
///a["true"] = "stringy true"
///a[false] = "false"
///a["false"] = "stringy false"
///a[a] = a
/// (enumerating object keys...)
/// (Found key2!)
/// (Found key3!)
/// (Found key4!)
///a.setPropertyIsEnumerable(key2, false);
///a.setPropertyIsEnumerable(key3, false);
///a.setPropertyIsEnumerable(key4, false);
/// (enumerating object keys...)
/// (Found key2!)
/// (Found key3!)
/// (Found key4!)
