1 files changed, 8 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb b/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb
index 458f8961a3..c96e63b169 100644
--- a/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb
+++ b/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb
@@ -41,6 +41,14 @@ class HashWithIndifferentAccess < Hash
     indices.collect {|key| self[convert_key(key)]}
   end
 
+  def dup
+    HashWithIndifferentAccess.new(self)
+  end
+  
+  def merge(hash)
+    self.dup.update(hash)
+  end
+  
   protected
     def convert_key(key)
       key.kind_of?(Symbol) ? key.to_s : key