1 files changed, 9 insertions, 0 deletions
diff --git a/python/google/protobuf/internal/type_checkers.py b/python/google/protobuf/internal/type_checkers.py
index 76c056c4..f20e526a 100755
--- a/python/google/protobuf/internal/type_checkers.py
+++ b/python/google/protobuf/internal/type_checkers.py
@@ -129,6 +129,9 @@ class IntValueChecker(object):
     proposed_value = self._TYPE(proposed_value)
     return proposed_value
 
+  def DefaultValue(self):
+    return 0
+
 
 class EnumValueChecker(object):
 
@@ -146,6 +149,9 @@ class EnumValueChecker(object):
       raise ValueError('Unknown enum value: %d' % proposed_value)
     return proposed_value
 
+  def DefaultValue(self):
+    return self._enum_type.values[0].number
+
 
 class UnicodeValueChecker(object):
 
@@ -171,6 +177,9 @@ class UnicodeValueChecker(object):
                          (proposed_value))
     return proposed_value
 
+  def DefaultValue(self):
+    return u""
+
 
 class Int32ValueChecker(IntValueChecker):
   # We're sure to use ints instead of longs here since comparison may be more