merge master

src/ObservableCollections/IObservableCollection.cs

@@ -49,6 +49,5 @@ namespace ObservableCollections
 
     public interface INotifyCollectionChangedSynchronizedView<out TView> : IReadOnlyCollection<TView>, INotifyCollectionChanged, INotifyPropertyChanged, IDisposable
     {
-        void Refresh();
     }
 }

src/ObservableCollections/SynchronizedViewList.cs

@@ -309,7 +309,7 @@ internal class NotifyCollectionChangedSynchronizedView<T, TView> :
 
     static bool IsCompatibleObject(object? value)
     {
-        return value is T || value == null && default(T) == null;
+        return value is TView || value == null && default(TView) == null;
     }
 
     public bool IsReadOnly => true;