Fix version handling for boolean groups.

mojo/public/python/mojo_bindings/serialization.py

Index: mojo/public/python/mojo_bindings/serialization.py
diff --git a/mojo/public/python/mojo_bindings/serialization.py b/mojo/public/python/mojo_bindings/serialization.py
index 2e887c283f3855491c2807be114abdfdf5731fbc..8f5cc67b515a7451466748e30889b3676faa337c 100644
--- a/mojo/public/python/mojo_bindings/serialization.py
+++ b/mojo/public/python/mojo_bindings/serialization.py
@@ -170,11 +170,12 @@ def NeededPaddingForAlignment(value, alignment=8):
 def _GetVersion(groups):
   if not len(groups):
     return 0
-  return max([x.version for x in groups])
+  return max([x.GetMaxVersion() for x in groups])
 
 
 def _FilterGroups(groups, version):
-  return [group for group in groups if group.GetVersion() <= version]
+  return [group.Filter(version) for
+          group in groups if group.GetMinVersion() <= version]
 
 
 def _GetStruct(groups):