Now that we have a separate internal rails_to_json, use a separate circular reference stack instead of sticking it in the options hash

actionpack/lib/action_view/helpers/prototype_helper.rb

@@ -1180,11 +1180,11 @@ module ActionView
 
       # The JSON Encoder calls this to check for the +to_json+ method
       # Since it's a blank slate object, I suppose it responds to anything.
-      def respond_to?(method)
+      def respond_to?(*)
         true
       end
 
-      def rails_to_json(options = nil)
+      def rails_to_json(*)
         @variable
       end
 

activesupport/lib/active_support/json/encoders/date.rb

@@ -12,7 +12,7 @@ class Date
     #   # With ActiveSupport.use_standard_json_time_format = false
     #   Date.new(2005,2,1).to_json
     #   # => "2005/02/01"
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       if ActiveSupport.use_standard_json_time_format
         %("#{strftime("%Y-%m-%d")}")
       else

activesupport/lib/active_support/json/encoders/date_time.rb

@@ -12,7 +12,7 @@ class DateTime
     #   # With ActiveSupport.use_standard_json_time_format = false
     #   DateTime.civil(2005,2,1,15,15,10).to_json
     #   # => "2005/02/01 15:15:10 +0000"
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       if ActiveSupport.use_standard_json_time_format
         xmlschema.inspect
       else

activesupport/lib/active_support/json/encoders/enumerable.rb

@@ -7,7 +7,7 @@ module Enumerable
     #   # => users.to_json(:only => :name)
     #
     # will pass the <tt>:only => :name</tt> option to each user.
-    def rails_to_json(options = nil) #:nodoc:
-      "[#{map { |value| ActiveSupport::JSON.encode(value, options) } * ','}]"
+    def rails_to_json(options = nil, *args) #:nodoc:
+      "[#{map { |value| ActiveSupport::JSON.encode(value, options, *args) } * ','}]"
     end
 end

activesupport/lib/active_support/json/encoders/false_class.rb

@@ -1,6 +1,6 @@
 class FalseClass
   private
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       'false'
     end
 end

activesupport/lib/active_support/json/encoders/hash.rb

@@ -31,7 +31,7 @@ class Hash
     # would pass the <tt>:include => :posts</tt> option to <tt>users</tt>,
     # allowing the posts association in the User model to be converted to JSON
     # as well.
-    def rails_to_json(options = nil) #:nodoc:
+    def rails_to_json(options = nil, *args) #:nodoc:
       hash_keys = self.keys
 
       if options
@@ -44,7 +44,7 @@ class Hash
 
       result = '{'
       result << hash_keys.map do |key|
-        "#{ActiveSupport::JSON.encode(key.to_s)}:#{ActiveSupport::JSON.encode(self[key], options)}"
+        "#{ActiveSupport::JSON.encode(key.to_s)}:#{ActiveSupport::JSON.encode(self[key], options, *args)}"
       end * ','
       result << '}'
     end

activesupport/lib/active_support/json/encoders/nil_class.rb

@@ -1,6 +1,6 @@
 class NilClass
   private
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       'null'
     end
 end

activesupport/lib/active_support/json/encoders/numeric.rb

@@ -1,6 +1,6 @@
 class Numeric
   private
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       to_s
     end
 end

activesupport/lib/active_support/json/encoders/object.rb

@@ -3,11 +3,11 @@ require 'active_support/core_ext/object/instance_variables'
 class Object
   # Dumps object in JSON (JavaScript Object Notation). See www.json.org for more info.
   def to_json(options = nil)
-    rails_to_json(options)
+    ActiveSupport::JSON.encode(self, options)
   end
 
   private
-    def rails_to_json(options = nil)
-      ActiveSupport::JSON.encode(instance_values, options)
+    def rails_to_json(*args)
+      ActiveSupport::JSON.encode(instance_values, *args)
     end
 end

activesupport/lib/active_support/json/encoders/regexp.rb

@@ -1,6 +1,6 @@
 class Regexp
   private
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       inspect
     end
 end

activesupport/lib/active_support/json/encoders/string.rb

@@ -1,6 +1,6 @@
 class String
   private
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       ActiveSupport::JSON::Encoding.escape(self)
     end
 end

activesupport/lib/active_support/json/encoders/symbol.rb

@@ -1,6 +1,6 @@
 class Symbol
   private
-    def rails_to_json(options = nil)
-      ActiveSupport::JSON.encode(to_s, options)
+    def rails_to_json(*args)
+      ActiveSupport::JSON.encode(to_s, *args)
     end
 end

activesupport/lib/active_support/json/encoders/time.rb

@@ -14,7 +14,7 @@ class Time
     #   # With ActiveSupport.use_standard_json_time_format = false
     #   Time.utc(2005,2,1,15,15,10).to_json
     #   # => "2005/02/01 15:15:10 +0000"
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       if ActiveSupport.use_standard_json_time_format
         xmlschema.inspect
       else

activesupport/lib/active_support/json/encoders/true_class.rb

@@ -1,6 +1,6 @@
 class TrueClass
   private
-    def rails_to_json(options = nil)
+    def rails_to_json(*)
       'true'
     end
 end

activesupport/lib/active_support/json/encoding.rb

@@ -4,12 +4,13 @@ module ActiveSupport
     end
 
     # Converts a Ruby object into a JSON string.
-    def self.encode(value, options = nil)
-      options ||= {}
-      seen = (options[:seen] ||= [])
-      raise CircularReferenceError, 'object references itself' if seen.include?(value.object_id)
-      seen << value.object_id
-      value.send(:rails_to_json, options)
+    def self.encode(value, options = nil, seen = nil)
+      seen ||= []
+      if seen.any? { |object| object.equal?(value) }
+        raise CircularReferenceError, 'object references itself'
+      end
+      seen << value
+      value.send(:rails_to_json, options, seen)
     ensure
       seen.pop
     end

activesupport/lib/active_support/json/variable.rb

@@ -3,7 +3,7 @@ module ActiveSupport
     # A string that returns itself as its JSON-encoded form.
     class Variable < String
       private
-        def rails_to_json(options = nil)
+        def rails_to_json(*)
           self
         end
     end

activesupport/lib/active_support/time_with_zone.rb

@@ -313,7 +313,7 @@ module ActiveSupport
       #   # With ActiveSupport.use_standard_json_time_format = false
       #   Time.utc(2005,2,1,15,15,10).in_time_zone.to_json
       #   # => "2005/02/01 15:15:10 +0000"
-      def rails_to_json(options = nil)
+      def rails_to_json(*)
         if !ActiveSupport.respond_to?(:use_standard_json_time_format) || ActiveSupport.use_standard_json_time_format
           xmlschema.inspect
         else