From 07677acafb05ff2f8359f5b1a6e78cb520de9f1a Mon Sep 17 00:00:00 2001
From: Colton Clemmer <cole.clemmer@gmail.com>
Date: Wed, 9 Aug 2017 16:04:50 -0500
Subject: [PATCH] Add toString function to subscribable

---
 spec/asyncBehaviors.js            | 5 +++++
 src/subscribables/subscribable.js | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/spec/asyncBehaviors.js b/spec/asyncBehaviors.js
index f2dc534eb..8403b691f 100644
--- a/spec/asyncBehaviors.js
+++ b/spec/asyncBehaviors.js
@@ -218,6 +218,11 @@ describe('Rate-limited', function() {
             jasmine.Clock.tick(250);
             expect(notifySpy).toHaveBeenCalledWith('b');
         });
+
+        it('Should return "[object Object]" with .toString', function() {
+          // Issue #2252: make sure .toString method does not throw error
+          expect(new ko.subscribable().toString()).toBe('[object Object]')
+        });
     });
 
     describe('Observable', function() {
diff --git a/src/subscribables/subscribable.js b/src/subscribables/subscribable.js
index 27f71faff..d6e39ab29 100644
--- a/src/subscribables/subscribable.js
+++ b/src/subscribables/subscribable.js
@@ -163,6 +163,10 @@ var ko_subscribable_fn = {
         return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);
     },
 
+    toString: function() {
+      return '[object Object]'
+    },
+
     extend: applyExtenders
 };