1 files changed, 1 insertions, 3 deletions
diff --git a/category.py b/category.py
index eda7ab7..ad33774 100644
--- a/category.py
+++ b/category.py
@@ -120,8 +120,6 @@ class Category:
         for key, value in self.args.iteritems():
             if not info.has_key(key):
                 args[key] = value
-            elif not value.singular():
-                args[key] = info[key]
             else:
-                args[key] = value
+                args[key] = value.intersect(info[key])
         return Category(self.name, **args)