Set the bytes to null after is has been disposed to allow multiple calls to dispose.

Author: dlemstra

src/Shared/PooledByteArray.cs

@@ -24,7 +24,13 @@ public int Length
         => _bytes.Length;
 
     public void Dispose()
-        => _pool.Return(_bytes);
+    {
+        if (_bytes == null)
+            return;
+
+        _pool.Return(_bytes);
+        _bytes = null!;
+    }
 
     public void Resize(int length)
     {