remove selaed to all observable collections

src/ObservableCollections/ObservableDictionary.Views.cs

@@ -7,7 +7,7 @@ using System.Linq;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableDictionary<TKey, TValue>
+    public partial class ObservableDictionary<TKey, TValue>
     {
         public ISynchronizedView<KeyValuePair<TKey, TValue>, TView> CreateView<TView>(Func<KeyValuePair<TKey, TValue>, TView> transform)
         {

src/ObservableCollections/ObservableDictionary.cs

@@ -7,7 +7,7 @@ using System.Linq;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, IReadOnlyObservableDictionary<TKey, TValue>
+    public partial class ObservableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, IReadOnlyObservableDictionary<TKey, TValue>
         where TKey : notnull
     {
         readonly Dictionary<TKey, TValue> dictionary;

src/ObservableCollections/ObservableFixedSizeRingBuffer.cs

@@ -5,7 +5,7 @@ using System.Collections.Generic;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableFixedSizeRingBuffer<T> : IList<T>, IReadOnlyList<T>, IObservableCollection<T>
+    public partial class ObservableFixedSizeRingBuffer<T> : IList<T>, IReadOnlyList<T>, IObservableCollection<T>
     {
         readonly RingBuffer<T> buffer;
         readonly int capacity;

src/ObservableCollections/ObservableHashSet.Views.cs

@@ -8,7 +8,7 @@ using System.Threading.Tasks;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableHashSet<T> : IReadOnlyCollection<T>, IObservableCollection<T>
+    public partial class ObservableHashSet<T> : IReadOnlyCollection<T>, IObservableCollection<T>
     {
         public ISynchronizedView<T, TView> CreateView<TView>(Func<T, TView> transform)
         {

src/ObservableCollections/ObservableHashSet.cs

@@ -8,7 +8,7 @@ using System.Linq;
 namespace ObservableCollections
 {
     // can not implements ISet<T> because set operation can not get added/removed values.
-    public sealed partial class ObservableHashSet<T> : IReadOnlySet<T>, IReadOnlyCollection<T>, IObservableCollection<T>
+    public partial class ObservableHashSet<T> : IReadOnlySet<T>, IReadOnlyCollection<T>, IObservableCollection<T>
         where T : notnull
     {
         readonly HashSet<T> set;

src/ObservableCollections/ObservableList.OptimizeView.cs

@@ -7,7 +7,7 @@ using System.Text;
 
 namespace ObservableCollections;
 
-public sealed partial class ObservableList<T> : IList<T>, IReadOnlyObservableList<T>
+public partial class ObservableList<T> : IList<T>, IReadOnlyObservableList<T>
 {
     // override extension methods(IObservableCollection.cs ObservableCollectionExtensions)
 

src/ObservableCollections/ObservableList.Views.cs

@@ -7,7 +7,7 @@ using System.Linq;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableList<T> : IList<T>, IReadOnlyObservableList<T>
+    public partial class ObservableList<T> : IList<T>, IReadOnlyObservableList<T>
     {
         public ISynchronizedView<T, TView> CreateView<TView>(Func<T, TView> transform)
         {

src/ObservableCollections/ObservableList.cs

@@ -7,7 +7,7 @@ using System.Runtime.InteropServices;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableList<T> : IList<T>, IReadOnlyObservableList<T>
+    public partial class ObservableList<T> : IList<T>, IReadOnlyObservableList<T>
     {
         readonly List<T> list;
         public object SyncRoot { get; } = new();

src/ObservableCollections/ObservableQueue.Views.cs

@@ -8,7 +8,7 @@ using System.Threading.Tasks;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableQueue<T> : IReadOnlyCollection<T>, IObservableCollection<T>
+    public partial class ObservableQueue<T> : IReadOnlyCollection<T>, IObservableCollection<T>
     {
         public ISynchronizedView<T, TView> CreateView<TView>(Func<T, TView> transform)
         {

src/ObservableCollections/ObservableQueue.cs

@@ -10,7 +10,7 @@ using System.Linq;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableQueue<T> : IReadOnlyCollection<T>, IObservableCollection<T>
+    public partial class ObservableQueue<T> : IReadOnlyCollection<T>, IObservableCollection<T>
     {
         readonly Queue<T> queue;
         public object SyncRoot { get; } = new object();

src/ObservableCollections/ObservableRingBuffer.Views.cs

@@ -8,7 +8,7 @@ using System.Threading.Tasks;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableRingBuffer<T>
+    public partial class ObservableRingBuffer<T>
     {
         public ISynchronizedView<T, TView> CreateView<TView>(Func<T, TView> transform)
         {

src/ObservableCollections/ObservableRingBuffer.cs

@@ -6,7 +6,7 @@ using System.Collections;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableRingBuffer<T> : IList<T>, IReadOnlyList<T>, IObservableCollection<T>
+    public partial class ObservableRingBuffer<T> : IList<T>, IReadOnlyList<T>, IObservableCollection<T>
     {
         readonly RingBuffer<T> buffer;
 

src/ObservableCollections/ObservableStack.Views.cs

@@ -7,7 +7,7 @@ using System.Linq;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableStack<T> : IReadOnlyCollection<T>, IObservableCollection<T>
+    public partial class ObservableStack<T> : IReadOnlyCollection<T>, IObservableCollection<T>
     {
         public ISynchronizedView<T, TView> CreateView<TView>(Func<T, TView> transform)
         {

src/ObservableCollections/ObservableStack.cs

@@ -8,7 +8,7 @@ using System.Runtime.CompilerServices;
 
 namespace ObservableCollections
 {
-    public sealed partial class ObservableStack<T> : IReadOnlyCollection<T>, IObservableCollection<T>
+    public partial class ObservableStack<T> : IReadOnlyCollection<T>, IObservableCollection<T>
     {
         readonly Stack<T> stack;
         public object SyncRoot { get; } = new object();

src/ObservableCollections/RingBuffer.cs

@@ -6,7 +6,7 @@ using System.Linq;
 
 namespace ObservableCollections
 {
-    public sealed class RingBuffer<T> : IList<T>, IReadOnlyList<T>
+    public class RingBuffer<T> : IList<T>, IReadOnlyList<T>
     {
         T[] buffer;
         int head;