Update CollectionExtensions to use IList instead of ICollection

Author: w-ahmad

src/Extensions/CollectionExtensions.cs

@@ -49,8 +49,8 @@ public static void RemoveWhere<T>(this ICollection<T> collection, Predicate<T> p
     /// <returns>The index of the item, or -1 if not found.</returns>
     public static int IndexOf(this IEnumerable enumerable, object? item)
     {
-        if (enumerable is ICollection collection)
-            return collection.IndexOf(item);
+        if (enumerable is IList list)
+            return list.IndexOf(item);
 
         if (enumerable is ICollectionView collectionView)
             return collectionView.IndexOf(item);
@@ -86,35 +86,35 @@ public static bool IsReadOnly(this IEnumerable enumerable)
 
     public static void Add(this IEnumerable enumerable, object? item)
     {
-        if (enumerable is ICollection collection)
-            collection.Add(item);
+        if (enumerable is IList list)
+            list.Add(item);
 
         if (enumerable is ICollectionView collectionView)
             collectionView.Add(item);
     }
 
     public static void Insert(this IEnumerable enumerable, int index, object? item)
     {
-        if (enumerable is ICollection collection)
-            collection.Insert(index, item);
+        if (enumerable is IList list)
+            list.Insert(index, item);
 
         if (enumerable is ICollectionView collectionView)
             collectionView.Insert(index, item);
     }
 
     public static void Remove(this IEnumerable enumerable, object? item)
     {
-        if (enumerable is ICollection collection)
-            collection.Remove(item);
+        if (enumerable is IList list)
+            list.Remove(item);
 
         if (enumerable is ICollectionView collectionView)
             collectionView.Remove(item);
     }
 
     public static void Clear(this IEnumerable enumerable)
     {
-        if (enumerable is ICollection collection)
-            collection.Clear();
+        if (enumerable is IList list)
+            list.Clear();
 
         if (enumerable is ICollectionView collectionView)
             collectionView.Clear();