Minor (possible) bug fix

Microsoft.Toolkit.Mvvm/Messaging/Messenger.cs

@@ -638,9 +638,14 @@ namespace Microsoft.Toolkit.Mvvm.Messaging
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public bool Equals(Type2 other)
             {
+                // We can't just use reference equality, as that's technically not guaranteed
+                // to work and might fail in very rare cases (eg. with type forwarding between
+                // different assemblies). Instead, we can use the == operator to compare for
+                // equality, which still avoids the callvirt overhead of calling Type.Equals,
+                // and is also implemented as a JIT intrinsic on runtimes such as .NET Core.
                 return
-                    ReferenceEquals(this.tMessage, other.tMessage) &&
-                    ReferenceEquals(this.tToken, other.tToken);
+                    this.tMessage == other.tMessage &&
+                    this.tToken == other.tToken;
             }
 
             /// <inheritdoc/>