From e308e2804ff0856bbf9f4a77647a6218ab9f2d6c Mon Sep 17 00:00:00 2001
From: Aaron Stannard <aaron@petabridge.com>
Date: Thu, 6 Oct 2022 13:31:55 -0500
Subject: [PATCH] Make `Envelope` a reference type again (#6137)

* convert `Envelope` back into a reference type

* approved API changes

* changed to `readonly struct`

* fixed API approvals
---
 src/core/Akka/Actor/Message.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/core/Akka/Actor/Message.cs b/src/core/Akka/Actor/Message.cs
index 2a315e5fada..f0983641073 100644
--- a/src/core/Akka/Actor/Message.cs
+++ b/src/core/Akka/Actor/Message.cs
@@ -12,7 +12,7 @@ namespace Akka.Actor
     /// <summary>
     /// Envelope class, represents a message and the sender of the message.
     /// </summary>
-    public struct Envelope
+    public readonly struct Envelope
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="Envelope"/> struct.
@@ -44,13 +44,13 @@ public Envelope(object message, IActorRef sender)
         /// Gets or sets the sender.
         /// </summary>
         /// <value>The sender.</value>
-        public IActorRef Sender { get; private set; }
+        public IActorRef Sender { get; }
 
         /// <summary>
         /// Gets or sets the message.
         /// </summary>
         /// <value>The message.</value>
-        public object Message { get; private set; }
+        public object Message { get; }
 
         /// <summary>
         /// Converts the <see cref="Envelope"/> to a string representation.