From 9da03f529f69a91d90627ae206c29c14005f7feb Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Sun, 6 Sep 2015 21:05:05 -0700
Subject: [PATCH] Ensure `equalByTag` passing `customizer` to `equalFunc`.

---
 lodash.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lodash.js b/lodash.js
index 94acc1b20..a0e0ce059 100644
--- a/lodash.js
+++ b/lodash.js
@@ -2308,7 +2308,7 @@
           isSameTag = objTag == othTag;
 
       if (isSameTag && !(objIsArr || objIsObj)) {
-        return equalByTag(object, other, objTag, equalFunc, bitmask);
+        return equalByTag(object, other, objTag, equalFunc, customizer, bitmask);
       }
       var isPartial = bitmask & PARTIAL_COMPARE_FLAG;
       if (!isPartial) {
@@ -3757,10 +3757,11 @@
      * @param {Object} other The other object to compare.
      * @param {string} tag The `toStringTag` of the objects to compare.
      * @param {Function} equalFunc The function to determine equivalents of values.
+     * @param {Function} [customizer] The function to customize comparisons.
      * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual` for more details.
      * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
      */
-    function equalByTag(object, other, tag, equalFunc, bitmask) {
+    function equalByTag(object, other, tag, equalFunc, customizer, bitmask) {
       switch (tag) {
         case boolTag:
         case dateTag:
@@ -3789,8 +3790,10 @@
         case setTag:
           var isPartial = bitmask & PARTIAL_COMPARE_FLAG;
           convert || (convert = setToArray);
+
+          // Recursively compare objects (susceptible to call stack limits).
           return (isPartial || object.size == other.size) &&
-            equalFunc(convert(object), convert(other), undefined, bitmask | UNORDERED_COMPARE_FLAG);
+            equalFunc(convert(object), convert(other), customizer, bitmask | UNORDERED_COMPARE_FLAG);
       }
       return false;
     }