From f6f0a3b7aee9ffa39cef4ecfa9f7f01f6b731c80 Mon Sep 17 00:00:00 2001
From: Daniel Freedman <dfreedm@google.com>
Date: Thu, 7 Sep 2017 15:32:25 -0700
Subject: [PATCH] a few more comments in return

---
 lib/legacy/mutable-data-behavior.html | 5 ++---
 lib/mixins/property-accessors.html    | 8 ++------
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/lib/legacy/mutable-data-behavior.html b/lib/legacy/mutable-data-behavior.html
index 4fb70cb53c..850edf185b 100644
--- a/lib/legacy/mutable-data-behavior.html
+++ b/lib/legacy/mutable-data-behavior.html
@@ -15,9 +15,8 @@
   'use strict';
 
   let mutablePropertyChange;
-  (
-    /** @suppress {missingProperties} */
-    function() {
+  /** @suppress {missingProperties} */
+  (() => {
     mutablePropertyChange = Polymer.MutableData._mutablePropertyChange;
   })();
 
diff --git a/lib/mixins/property-accessors.html b/lib/mixins/property-accessors.html
index c1977997cd..ab29006966 100644
--- a/lib/mixins/property-accessors.html
+++ b/lib/mixins/property-accessors.html
@@ -605,12 +605,8 @@
        * @protected
        */
       _shouldPropertyChange(property, value, old) {
-        return (
-          // Strict equality check
-          (old !== value &&
-           // This ensures (old==NaN, value==NaN) always returns false
-           (old === old || value === value))
-        );
+        // check equality, and ensure (old == NaN, value == NaN) always returns false
+        return old !== value && (old === old || value === value);
       }
 
     }