Fix filtering parameters when there are Fixnum or other un-dupable values.

[#3184 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

actionpack/lib/action_controller/metal/filter_parameter_logging.rb

@@ -49,7 +49,7 @@ def filter_parameter_logging(*filter_words, &block)
               end
             elsif block_given?
               key = key.dup
-              value = value.dup if value
+              value = value.dup if value.duplicable?
               yield key, value
               filtered_parameters[key] = value
             else

actionpack/test/controller/filter_params_test.rb

@@ -35,6 +35,7 @@ def test_filter_parameters
     test_hashes = [[{},{},[]],
     [{'foo'=>nil},{'foo'=>nil},[]],
     [{'foo'=>'bar'},{'foo'=>'bar'},[]],
+    [{'foo'=>1},{'foo'=>1},[]],
     [{'foo'=>'bar'},{'foo'=>'bar'},%w'food'],
     [{'foo'=>'bar'},{'foo'=>'[FILTERED]'},%w'foo'],
     [{'foo'=>'bar', 'bar'=>'foo'},{'foo'=>'[FILTERED]', 'bar'=>'foo'},%w'foo baz'],