* Additional _disposed checks in Connection.

Author: lukebakken

projects/RabbitMQ.Client/Impl/Connection.cs

@@ -487,10 +487,23 @@ internal ValueTask WriteAsync(RentedMemory frames, CancellationToken cancellatio
             return _frameHandler.WriteAsync(frames, cancellationToken);
         }
 
-        public void Dispose() => DisposeAsync().AsTask().GetAwaiter().GetResult();
+        public void Dispose()
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            DisposeAsync().AsTask().GetAwaiter().GetResult();
+        }
 
         public async ValueTask DisposeAsync()
         {
+            if (_disposed)
+            {
+                return;
+            }
+
             if (IsDisposing)
             {
                 return;