Fix OrderedHash#to_hash to return self instead of a new hash with self as default value

activesupport/lib/active_support/ordered_hash.rb

@@ -54,7 +54,7 @@ module ActiveSupport
       end
 
       def to_hash
-        Hash.new(self)
+        self
       end
 
       def each_key

activesupport/test/ordered_hash_test.rb

@@ -45,6 +45,10 @@ class OrderedHashTest < Test::Unit::TestCase
     assert_nil @ordered_hash.delete(bad_key)
   end
 
+  def test_to_hash
+    assert_same @ordered_hash, @ordered_hash.to_hash
+  end
+
   def test_has_key
     assert_equal true, @ordered_hash.has_key?('blue')
     assert_equal true, @ordered_hash.key?('blue')
@@ -148,4 +152,4 @@ class OrderedHashTest < Test::Unit::TestCase
     @ordered_hash.keys.pop
     assert_equal original, @ordered_hash.keys
   end
-end
+end