From 8a6dab03c44999dbf6b47041a96123887d230bbd Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Thu, 15 Jan 2015 20:07:41 -0800
Subject: [PATCH] Tighten `isIndex` and `isIterateeCall`.

---
 lodash.src.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lodash.src.js b/lodash.src.js
index a5ea7809b..7627bfb4c 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -520,12 +520,13 @@
    *
    * @private
    * @param {*} value The value to check.
-   * @param {number} [length] The upper bounds of a valid index.
+   * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
    * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
    */
   function isIndex(value, length) {
     value = +value;
-    return value > -1 && value % 1 == 0 && (length == null || value < length);
+    length = length == null ? MAX_SAFE_INTEGER : length;
+    return value > -1 && value % 1 == 0 && value < length;
   }
 
   /**
@@ -3750,7 +3751,7 @@
         var length = object.length,
             prereq = isLength(length) && isIndex(index, length);
       } else {
-        prereq = type == 'string';
+        prereq = type == 'string' && index in value;
       }
       return prereq && object[index] === value;
     }