Cleanup: ConnectionMultiplexer

StackExchange.Redis/StackExchange/Redis/KeyspaceIsolation/DatabaseExtension.cs

@@ -54,10 +54,9 @@ public static IDatabase WithKeyPrefix(this IDatabase database, RedisKey keyPrefi
                 return database; // fine - you can keep using the original, then
             }
 
-            if(database is DatabaseWrapper)
+            if (database is DatabaseWrapper wrapper)
             {
                 // combine the key in advance to minimize indirection
-                var wrapper = (DatabaseWrapper)database;
                 keyPrefix = wrapper.ToInner(keyPrefix);
                 database = wrapper.Inner;
             }

StackExchange.Redis/StackExchange/Redis/TaskExtensions.cs

+using System;
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
+
+namespace StackExchange.Redis
+{
+    internal static class TaskExtensions
+    {
+        private static readonly Action<Task> observeErrors = ObverveErrors;
+        private static void ObverveErrors(this Task task)
+        {
+            if (task != null) GC.KeepAlive(task.Exception);
+        }
+
+        public static Task ObserveErrors(this Task task)
+        {
+            task?.ContinueWith(observeErrors, TaskContinuationOptions.OnlyOnFaulted);
+            return task;
+        }
+
+        public static Task<T> ObserveErrors<T>(this Task<T> task)
+        {
+            task?.ContinueWith(observeErrors, TaskContinuationOptions.OnlyOnFaulted);
+            return task;
+        }
+
+        public static ConfiguredTaskAwaitable ForAwait(this Task task) => task.ConfigureAwait(false);
+        public static ConfiguredTaskAwaitable<T> ForAwait<T>(this Task<T> task) => task.ConfigureAwait(false);
+    }
+}