From ffb3a994a2984e740834b962eaf777538ec6d43e Mon Sep 17 00:00:00 2001
From: David Pine <david.pine@microsoft.com>
Date: Tue, 5 Sep 2023 07:41:17 -0500
Subject: [PATCH] Update Writer.cs

---
 src/Orleans.Serialization/Buffers/Writer.cs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/Orleans.Serialization/Buffers/Writer.cs b/src/Orleans.Serialization/Buffers/Writer.cs
index 76825d0ee4..a003afe1e6 100644
--- a/src/Orleans.Serialization/Buffers/Writer.cs
+++ b/src/Orleans.Serialization/Buffers/Writer.cs
@@ -155,11 +155,12 @@ internal Writer(TBufferWriter output, Span<byte> span, SerializerSession session
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void Dispose()
         {
+            // Avoid boxing the struct, for better perf and codegen.
             if (typeof(TBufferWriter).IsValueType)
             {
-                if (Output is IDisposable disposable)
+                if (Output is IDisposable)
                 {
-                    disposable.Dispose();
+                    ((IDisposable)Output).Dispose();
                 }
             }
             else
@@ -548,4 +549,4 @@ private void WriteVarUInt64Slow(ulong value)
             BinaryPrimitives.WriteUInt16LittleEndian(_currentSpan.Slice(sizeof(ulong)), (ushort)upper);
         }
     }
-}
\ No newline at end of file
+}