Using the sum of bytes instead the hash of the path when replacing the wildcard of the assets path because in ruby 1.9 is not consistent

actionpack/lib/action_view/asset_paths.rb

@@ -111,7 +111,8 @@ module ActionView
           args << current_request if (arity > 1 || arity < 0) && has_request?
           host.call(*args)
         else
-          (host =~ /%d/) ? host % (source.hash % 4) : host
+          source_num = source.bytes.sum
+          (host =~ /%d/) ? host % (source_num % 4) : host
         end
       end
     end

actionpack/test/template/asset_tag_helper_test.rb

@@ -689,9 +689,9 @@ class AssetTagHelperTest < ActionView::TestCase
     @controller.config.asset_host = 'http://a%d.example.com'
     config.perform_caching = true
 
-    hash = '/javascripts/cache/money.js'.hash % 4
+    number = '/javascripts/cache/money.js'.bytes.sum % 4
     assert_dom_equal(
-      %(<script src="http://a#{hash}.example.com/javascripts/cache/money.js" type="text/javascript"></script>),
+      %(<script src="http://a#{number}.example.com/javascripts/cache/money.js" type="text/javascript"></script>),
       javascript_include_tag(:all, :cache => "cache/money")
     )
 
@@ -1129,6 +1129,7 @@ class AssetTagHelperNonVhostTest < ActionView::TestCase
   end
 
   def test_should_wildcard_asset_host_between_zero_and_four
+    String.any_instance.expects(:hash).times(0)
     @controller.config.asset_host = 'http://a%d.example.com'
     assert_match(%r(http://a[0123].example.com/collaboration/hieraki/images/xml.png), image_path('xml.png'))
   end