The implementation is backed by a smaller `IWinePropertySetImpl` interface for core operations (insertion, lookup, removal, iteration), which currently uses an `rb_tree` to store `HSTRING`-`IInspectable *` value pairs.
If needed, the `IWinePropertySetImpl` implementation can be later swapped out with a hash table for performance reasons, as `PropertySet` does not have an enumeration order guarantee, at least according to the MSDN docs.
-- v15: wintypes: Add stubs for IKeyValuePair<HSTRING, IInspectable *>. wintypes: Add stubs for IIterator<IKeyValuePair<HSTRING, IInspectable *>>. wintypes: Add stubs for IMapView<HSTRING, IInspectable *>. wintypes: Add IIterable<IKeyValuePair<HSTRING, IInspectable *>> stubs to PropertySet implementation wintypes: Add IObservableMap<HSTRING, IInspectable *> and stubs to PropertySet implementation. wintypes: Add IMap<HSTRING, IInspectable *> stubs to PropertySet implementation.