Psych subclasses of String lose string value

gistfile1.diff

diff --git a/test/psych/test_array.rb b/test/psych/test_array.rb
index 9eedbb4..5058676 100644
--- a/test/psych/test_array.rb
+++ b/test/psych/test_array.rb
@@ -25,7 +25,11 @@ module Psych
     end
 
     def test_subclass_with_attributes
-      y = Psych.load Psych.dump Y.new.tap {|y| y.val = 1}
+      y = Y.new.tap {|y| y.val = 1}
+      y << "foo" << "bar"
+      y = Psych.load Psych.dump y
+
+      assert_equal %w{foo bar}, y
       assert_equal Y, y.class
       assert_equal 1, y.val
     end
diff --git a/test/psych/test_string.rb b/test/psych/test_string.rb
index c7d5c60..ade408d 100644
--- a/test/psych/test_string.rb
+++ b/test/psych/test_string.rb
@@ -22,7 +22,8 @@ module Psych
     end
 
     def test_subclass_with_attributes
-      y = Psych.load Psych.dump Y.new.tap {|y| y.val = 1}
+      y = Psych.load Psych.dump Y.new("foo").tap {|y| y.val = 1}
+      assert_equal "foo", y
       assert_equal Y, y.class
       assert_equal 1, y.val
     end