From b2504adb304136d5ed6bdc49ad8dc8538c56f248 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Tue, 10 Jan 2017 19:26:26 -0800
Subject: [PATCH] Fix `isFlattenable`.

---
 .internal/isFlattenable.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.internal/isFlattenable.js b/.internal/isFlattenable.js
index e3c51cf73..8392e0f63 100644
--- a/.internal/isFlattenable.js
+++ b/.internal/isFlattenable.js
@@ -1,5 +1,8 @@
 import isArguments from './isArguments.js';
 
+/** Built-in value reference. */
+const spreadableSymbol = Symbol.isConcatSpreadable;
+
 /**
  * Checks if `value` is a flattenable `arguments` object or array.
  *
@@ -9,7 +12,7 @@ import isArguments from './isArguments.js';
  */
 function isFlattenable(value) {
   return Array.isArray(value) || isArguments(value) ||
-    !!(Symbol.isConcatSpreadable && value && value[spreadableSymbol]);
+    !!(spreadableSymbol && value && value[spreadableSymbol]);
 }
 
 export default isFlattenable;