From 03b9f6fe26654e916f5e2dc7e9154ed51e5f1e99 Mon Sep 17 00:00:00 2001
From: Brian White <mscdex@mscdex.net>
Date: Sat, 31 Dec 2016 16:33:36 -0500
Subject: [PATCH] stream: avoid instanceof

PR-URL: https://github.com/nodejs/node/pull/10558
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
---
 lib/_stream_writable.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index e1c912b3338915..af97fc2d8180c6 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -284,9 +284,11 @@ function decodeChunk(state, chunk, encoding) {
 // If we return false, then we need a drain event, so set that flag.
 function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
   if (!isBuf) {
-    chunk = decodeChunk(state, chunk, encoding);
-    if (chunk instanceof Buffer)
+    var newChunk = decodeChunk(state, chunk, encoding);
+    if (chunk !== newChunk) {
       encoding = 'buffer';
+      chunk = newChunk;
+    }
   }
   var len = state.objectMode ? 1 : chunk.length;