diff --git a/lodash.js b/lodash.js
index 7816055c6..19ab64263 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1024,7 +1024,7 @@
   }
 
   /**
-   * Checks if a cache value for `key` exists.
+   * Checks if a `cache` value for `key` exists.
    *
    * @private
    * @param {Object} cache The cache to query.
@@ -5437,9 +5437,9 @@
         // Recursively compare arrays (susceptible to call stack limits).
         if (seen) {
           if (!arraySome(other, function(othValue, othIndex) {
-                if (!seen.has(othIndex) &&
+                if (!cacheHas(seen, othIndex) &&
                     (arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
-                  return seen.add(othIndex);
+                  return seen.push(othIndex);
                 }
               })) {
             result = false;