--- a/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeObject.java	Tue May 08 11:49:42 2018 +0530
+++ b/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeObject.java	Tue May 08 09:41:10 2018 +0200
@@ -66,6 +66,7 @@
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
+import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
 import jdk.nashorn.internal.runtime.linker.Bootstrap;
 import jdk.nashorn.internal.runtime.linker.InvokeByName;
 import jdk.nashorn.internal.runtime.linker.NashornBeansLinker;
@@ -613,8 +614,13 @@
         final Object obj = Global.toObject(self);
 
         if (obj instanceof ScriptObject) {
-            final jdk.nashorn.internal.runtime.Property property = ((ScriptObject)obj).getMap().findProperty(str);
-            return property != null && property.isEnumerable();
+            final ScriptObject sobj = (ScriptObject) obj;
+            final Property property = sobj.getProperty(str);
+            if (property != null) {
+                return property.isEnumerable();
+            } else {
+                return (sobj.getArray().has(ArrayIndex.getArrayIndex(v)));
+            }
         }
 
         return false;

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/nashorn/script/basic/JDK-8200716.js	Tue May 08 09:41:10 2018 +0200
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8200716: Object propertyIsEnumerable buggy behavior on short integer-string key
+ *
+ * @test
+ * @run
+ */
+
+
+var o = ({ '1': 1 });
+Assert.assertTrue(o.propertyIsEnumerable('1'));
+
+Object.defineProperty(o, '1', { enumerable: false, value: 1 });
+Assert.assertFalse(o.propertyIsEnumerable('1'));
+
+Object.defineProperty(o, '1', { enumerable: true, value: 1 });
+Assert.assertTrue(o.propertyIsEnumerable('1'));