Allow the use of 'missing=None' for Number

CHANGES.txt

@@ -1,6 +1,12 @@
 Changes
 =======
 
+Next release
+------------
+
+- Allow the use of 'missing=None' for Number.  See
+  https://github.com/Pylons/colander/pull/59 .
+
 0.9.8 (2012-04-27)
 ------------------
 

colander/__init__.py

@@ -951,7 +951,7 @@ class Number(SchemaType):
     num = None
 
     def serialize(self, node, appstruct):
-        if not appstruct:
+        if appstruct in (null, None):
             return null
 
         try:

colander/tests/test_colander.py

@@ -1192,6 +1192,13 @@ class TestInteger(unittest.TestCase):
         result = typ.serialize(node, val)
         self.assertEqual(result, '1')
 
+    def test_serialize_zero(self):
+        val = 0
+        node = DummySchemaNode(None)
+        typ = self._makeOne()
+        result = typ.serialize(node, val)
+        self.assertEqual(result, '0')
+
 class TestFloat(unittest.TestCase):
     def _makeOne(self):
         from colander import Float

setup.py

@@ -32,7 +32,7 @@ testing_extras = ['nose', 'coverage']
 docs_extras = ['Sphinx']
 
 setup(name='colander',
-      version='0.9.8',
+      version='0.9.9dev1',
       description=('A simple schema-based serialization and deserialization '
                    'library'),
       long_description=README + '\n\n' +  CHANGES,