From b1e6e753fff37c56b0241307a0a76191469f5c2c Mon Sep 17 00:00:00 2001
From: Sergey Tsvetkov <sergey.a.tsvetkov@gmail.com>
Date: Tue, 17 May 2016 15:52:15 +0300
Subject: [PATCH] Used instanceof to determine FormData in utils.isFormData.
 Fix #323.

---
 lib/utils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/utils.js b/lib/utils.js
index 33f2d4d..b0d376b 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -33,7 +33,7 @@ function isArrayBuffer(val) {
  * @returns {boolean} True if value is an FormData, otherwise false
  */
 function isFormData(val) {
-  return toString.call(val) === '[object FormData]';
+  return (typeof FormData !== 'undefined') && (val instanceof FormData);
 }
 
 /**