Code cleanups

Src/FluentAssertions/Common/ReadOnlyNonGenericCollectionWrapper.cs

@@ -47,7 +47,7 @@ public ReadOnlyNonGenericCollectionWrapper(TCollection collection)
 
     public int Count => UnderlyingCollection.Count;
 
-    public bool IsReadOnly => true;
+    bool ICollection<TItem>.IsReadOnly => true;
 
     public IEnumerator<TItem> GetEnumerator() => UnderlyingCollection.Cast<TItem>().GetEnumerator();
 
@@ -57,18 +57,9 @@ public ReadOnlyNonGenericCollectionWrapper(TCollection collection)
 
     public void CopyTo(TItem[] array, int arrayIndex) => UnderlyingCollection.CopyTo(array, arrayIndex);
 
-    /*
+    void ICollection<TItem>.Add(TItem item) => throw new NotSupportedException();
 
-    Mutation is not supported, but these methods must be implemented to satisfy ICollection<T>:
-    * Add
-    * Clear
-    * Remove
+    void ICollection<TItem>.Clear() => throw new NotSupportedException();
 
-    */
-
-    public void Add(TItem item) => throw new NotSupportedException();
-
-    public void Clear() => throw new NotSupportedException();
-
-    public bool Remove(TItem item) => throw new NotSupportedException();
+    bool ICollection<TItem>.Remove(TItem item) => throw new NotSupportedException();
 }

Src/FluentAssertions/DataColumnCollectionAssertionExtensions.cs

@@ -73,7 +73,7 @@ public static class DataColumnCollectionAssertionExtensions
         Guard.ThrowIfArgumentIsNull(
             unexpected, nameof(unexpected), "Cannot verify same reference against a <null> collection (use NotBeNull instead?).");
 
-        if (assertion.Subject is ReadOnlyNonGenericCollectionWrapper<DataColumnCollection, DataColumn> wrapper)
+        if (assertion.Subject is ICollectionWrapper<DataColumnCollection> wrapper)
         {
             var actualSubject = wrapper.UnderlyingCollection;
 

Src/FluentAssertions/DataRowCollectionAssertionExtensions.cs

@@ -28,7 +28,7 @@ public static class DataRowCollectionAssertionExtensions
         this GenericCollectionAssertions<DataRow> assertion, DataRowCollection expected, string because = "",
         params object[] becauseArgs)
     {
-        if (assertion.Subject is ReadOnlyNonGenericCollectionWrapper<DataRowCollection, DataRow> wrapper)
+        if (assertion.Subject is ICollectionWrapper<DataRowCollection> wrapper)
         {
             var actualSubject = wrapper.UnderlyingCollection;
 
@@ -68,7 +68,7 @@ public static class DataRowCollectionAssertionExtensions
         this GenericCollectionAssertions<DataRow> assertion, DataRowCollection unexpected, string because = "",
         params object[] becauseArgs)
     {
-        if (assertion.Subject is ReadOnlyNonGenericCollectionWrapper<DataRowCollection, DataRow> wrapper)
+        if (assertion.Subject is ICollectionWrapper<DataRowCollection> wrapper)
         {
             var actualSubject = wrapper.UnderlyingCollection;
 

Src/FluentAssertions/DataTableCollectionAssertionExtensions.cs

@@ -25,7 +25,7 @@ public static class DataTableCollectionAssertionExtensions
         this GenericCollectionAssertions<DataTable> assertion, DataTableCollection expected, string because = "",
         params object[] becauseArgs)
     {
-        if (assertion.Subject is ReadOnlyNonGenericCollectionWrapper<DataTableCollection, DataTable> wrapper)
+        if (assertion.Subject is ICollectionWrapper<DataTableCollection> wrapper)
         {
             var actualSubject = wrapper.UnderlyingCollection;
 
@@ -65,7 +65,7 @@ public static class DataTableCollectionAssertionExtensions
         this GenericCollectionAssertions<DataTable> assertion, DataTableCollection unexpected, string because = "",
         params object[] becauseArgs)
     {
-        if (assertion.Subject is ReadOnlyNonGenericCollectionWrapper<DataTableCollection, DataTable> wrapper)
+        if (assertion.Subject is ICollectionWrapper<DataTableCollection> wrapper)
         {
             var actualSubject = wrapper.UnderlyingCollection;
 

Src/FluentAssertions/Equivalency/Field.cs

@@ -46,16 +46,6 @@ public object GetValue(object obj)
 
     public CSharpAccessModifier SetterAccessibility => fieldInfo.GetCSharpAccessModifier();
 
-    public bool IsBrowsable
-    {
-        get
-        {
-            if (isBrowsable == null)
-            {
-                isBrowsable = fieldInfo.GetCustomAttribute<EditorBrowsableAttribute>() is not { State: EditorBrowsableState.Never };
-            }
-
-            return isBrowsable.Value;
-        }
-    }
+    public bool IsBrowsable =>
+        isBrowsable ??= fieldInfo.GetCustomAttribute<EditorBrowsableAttribute>() is not { State: EditorBrowsableState.Never };
 }

Src/FluentAssertions/Events/EventMonitor.cs

@@ -16,8 +16,7 @@ internal class EventMonitor<T> : IMonitor<T>
 {
     private readonly WeakReference subject;
 
-    private readonly ConcurrentDictionary<string, EventRecorder> recorderMap =
-        new ConcurrentDictionary<string, EventRecorder>();
+    private readonly ConcurrentDictionary<string, EventRecorder> recorderMap = new();
 
     public EventMonitor(object eventSource, Func<DateTime> utcNow)
     {