fix msg.client visibility

src/Message/Msg.php

@@ -19,7 +19,7 @@ class Msg extends Prototype
     public ?int $timestampNanos = null;
     public ?string $replyTo = null;
 
-    public readonly Client $client;
+    private ?Client $client = null;
 
     public static function create(string $data): self
     {
@@ -70,6 +70,11 @@ public function ack(): void
         ]));
     }
 
+    public function getClient(): ?Client
+    {
+        return $this->client;
+    }
+
     public function nack(float $delay = 0): void
     {
         $this->reply(new Ack([
@@ -81,14 +86,6 @@ public function nack(float $delay = 0): void
         ]));
     }
 
-    public function progress(): void
-    {
-        $this->reply(new Ack([
-            'command' => '+WPI',
-            'subject' => $this->replyTo,
-        ]));
-    }
-
     public function parse($payload): self
     {
         $headers = [];
@@ -126,6 +123,14 @@ public function parse($payload): self
         return $this;
     }
 
+    public function progress(): void
+    {
+        $this->reply(new Ack([
+            'command' => '+WPI',
+            'subject' => $this->replyTo,
+        ]));
+    }
+
     public function render(): string
     {
         return 'MSG ' . json_encode($this);