1 files changed, 8 insertions, 9 deletions
diff --git a/node_modules/core-js/modules/es6.symbol.js b/node_modules/core-js/modules/es6.symbol.js
index f27076e11..5bf7c4884 100644
--- a/node_modules/core-js/modules/es6.symbol.js
+++ b/node_modules/core-js/modules/es6.symbol.js
@@ -13,10 +13,10 @@ var uid = require('./_uid');
 var wks = require('./_wks');
 var wksExt = require('./_wks-ext');
 var wksDefine = require('./_wks-define');
-var keyOf = require('./_keyof');
 var enumKeys = require('./_enum-keys');
 var isArray = require('./_is-array');
 var anObject = require('./_an-object');
+var isObject = require('./_is-object');
 var toIObject = require('./_to-iobject');
 var toPrimitive = require('./_to-primitive');
 var createDesc = require('./_property-desc');
@@ -177,9 +177,9 @@ $export($export.S + $export.F * !USE_NATIVE, 'Symbol', {
       : SymbolRegistry[key] = $Symbol(key);
   },
   // 19.4.2.5 Symbol.keyFor(sym)
-  keyFor: function keyFor(key) {
-    if (isSymbol(key)) return keyOf(SymbolRegistry, key);
-    throw TypeError(key + ' is not a symbol!');
+  keyFor: function keyFor(sym) {
+    if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol!');
+    for (var key in SymbolRegistry) if (SymbolRegistry[key] === sym) return key;
   },
   useSetter: function () { setter = true; },
   useSimple: function () { setter = false; }
@@ -209,15 +209,14 @@ $JSON && $export($export.S + $export.F * (!USE_NATIVE || $fails(function () {
   return _stringify([S]) != '[null]' || _stringify({ a: S }) != '{}' || _stringify(Object(S)) != '{}';
 })), 'JSON', {
   stringify: function stringify(it) {
-    if (it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
     var args = [it];
     var i = 1;
     var replacer, $replacer;
     while (arguments.length > i) args.push(arguments[i++]);
-    replacer = args[1];
-    if (typeof replacer == 'function') $replacer = replacer;
-    if ($replacer || !isArray(replacer)) replacer = function (key, value) {
-      if ($replacer) value = $replacer.call(this, key, value);
+    $replacer = replacer = args[1];
+    if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
+    if (!isArray(replacer)) replacer = function (key, value) {
+      if (typeof $replacer == 'function') value = $replacer.call(this, key, value);
       if (!isSymbol(value)) return value;
     };
     args[1] = replacer;