diff --git a/test/model.test.js b/test/model.test.js
index bc92e4f..8c84f8e 100644
--- a/test/model.test.js
+++ b/test/model.test.js
@@ -11,7 +11,7 @@ var model = require('../lib/model')
 
 describe('Model', function () {
 
-  describe('Serialization, deserialization', function () {
+  describe.only('Serialization, deserialization', function () {
 
     it('Can serialize and deserialize strings', function () {
       var a, b, c;
@@ -162,6 +162,12 @@ describe('Model', function () {
       });
     });
 
+    it('Can accept objects whose keys are numbers', function () {
+      var o = { 42: true };
+
+      var s = model.serialize(o);
+    });
+
   });   // ==== End of 'Serialization, deserialization' ==== //