From d66d840e3b4750f64ae5a957a63159de49cc38ce Mon Sep 17 00:00:00 2001
From: Trevor Norris <trev.norris@gmail.com>
Date: Mon, 12 Aug 2013 13:41:51 -0700
Subject: [PATCH] util: fix isPrimitive check

Previous check failed for the edge case Object.create(null). This uses
the current v8 code for the check.
---
 lib/util.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/util.js b/lib/util.js
index 1b168bfd945..5addac5c3aa 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -506,7 +506,12 @@ function isFunction(arg) {
 exports.isFunction = isFunction;
 
 function isPrimitive(arg) {
-  return !(arg instanceof Object);
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
 }
 exports.isPrimitive = isPrimitive;