From 74907b9a10d0ce2fe2bea0da455d553b87df0566 Mon Sep 17 00:00:00 2001
From: Steven Orvell <sorvell@google.com>
Date: Wed, 7 Feb 2018 17:15:30 -0800
Subject: [PATCH] [PropertiesChanged]: allow old data to be gc'd after
 `_propertiesChanged`

---
 lib/mixins/properties-changed.html | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/mixins/properties-changed.html b/lib/mixins/properties-changed.html
index 203874d523..bd47e08c73 100644
--- a/lib/mixins/properties-changed.html
+++ b/lib/mixins/properties-changed.html
@@ -337,6 +337,7 @@
           const old = this.__dataOld;
           if (this._shouldPropertiesChange(props, changedProps, old)) {
             this.__dataPending = null;
+            this.__dataOld = null;
             this._propertiesChanged(props, changedProps, old);
           }
         }