From dd55830bb279a4ef492727d6ffda169eb569ba27 Mon Sep 17 00:00:00 2001
From: Matthew Mongeau <matt@toastyapps.com>
Date: Tue, 17 Aug 2010 16:46:02 -0400
Subject: to_sentence should return a duplicate

---
 activesupport/lib/active_support/core_ext/array/conversions.rb | 2 +-
 activesupport/test/core_ext/array_ext_test.rb                  | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/activesupport/lib/active_support/core_ext/array/conversions.rb b/activesupport/lib/active_support/core_ext/array/conversions.rb
index 7585137aca..baefa9cae4 100644
--- a/activesupport/lib/active_support/core_ext/array/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/array/conversions.rb
@@ -26,7 +26,7 @@ class Array
       when 0
         ""
       when 1
-        self[0].to_s
+        self[0].to_s.dup
       when 2
         "#{self[0]}#{options[:two_words_connector]}#{self[1]}"
       else
diff --git a/activesupport/test/core_ext/array_ext_test.rb b/activesupport/test/core_ext/array_ext_test.rb
index d14ae39737..d7ab3ce605 100644
--- a/activesupport/test/core_ext/array_ext_test.rb
+++ b/activesupport/test/core_ext/array_ext_test.rb
@@ -82,6 +82,11 @@ class ArrayExtToSentenceTests < Test::Unit::TestCase
     assert_equal "one", ['one'].to_sentence
   end
 
+  def test_one_element_not_same_object
+    elements = ["one"]
+    assert_not_equal elements[0].object_id, elements.to_sentence.object_id
+  end
+
   def test_one_non_string_element
     assert_equal '1', [1].to_sentence
   end
-- 
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