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diff --git a/ChangeLog b/ChangeLog
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@@ -1,3 +1,8 @@
+Tue Dec 16 22:15:17 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* lib/minitest/unit.rb (MiniTest::Assertions#assert_instance_of):
+	  should assert by instance_of?, not ===.  [ruby-dev:37458]
+
 Tue Dec 16 21:59:29 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* lib/test/unit.rb (Test::Unit.setup_argv): ALT_SEPARATOR support.