[FIXUP] Limit use of native window.Set to when Set(iterable) is suppo…

…rted

Avoid IE11 failure, where we otherwise fail to do proper recursion checks
against cyclical JSON.

Ref #1700 (comment)

src/globals.js

@@ -113,7 +113,11 @@ export const StringMap = typeof g.Map === 'function' &&
     }
   };
 
-export const StringSet = typeof g.Set === 'function'
+// Basic fallback for ES6 Set
+// Support: IE 11, `new Set(iterable)` parameter not yet implemented
+// Test for Set#values() which came after Set(iterable).
+export const StringSet = typeof g.Set === 'function' &&
+  typeof g.Set.prototype.values === 'function'
   ? g.Set
   : function (input) {
     const set = Object.create(null);