removes the compatibility method Module#instance_method_names

actionpack/lib/action_view/helpers/form_helper.rb

@@ -5,7 +5,6 @@ require 'action_view/helpers/form_tag_helper'
 require 'action_view/helpers/active_model_helper'
 require 'active_support/core_ext/class/attribute'
 require 'active_support/core_ext/hash/slice'
-require 'active_support/core_ext/module/method_names'
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/string/output_safety'
 require 'active_support/core_ext/array/extract_options'
@@ -1232,7 +1231,7 @@ module ActionView
     class FormBuilder
       # The methods which wrap a form helper call.
       class_attribute :field_helpers
-      self.field_helpers = FormHelper.instance_method_names - %w(form_for convert_to_model)
+      self.field_helpers = FormHelper.instance_methods - [:form_for, :convert_to_model]
 
       attr_accessor :object_name, :object, :options
 

activesupport/CHANGELOG.md

@@ -1,7 +1,10 @@
 ## Rails 4.0.0 (unreleased) ##
 
-* BufferedLogger is deprecated.  Use ActiveSupport::Logger, or the logger
-  from Ruby stdlib.
+*    Deletes the compatibility method Module#instance_method_names,
+     use Module#instance_methods from now on (which returns symbols). *fxn*
+
+*    BufferedLogger is deprecated.  Use ActiveSupport::Logger, or the logger
+     from Ruby stdlib.
 
 ## Rails 3.2.0 (unreleased) ##
 

activesupport/lib/active_support/core_ext/module/method_names.rb

@@ -1,8 +1,4 @@
 class Module
-  def instance_method_names(*args)
-    instance_methods(*args).map { |name| name.to_s }
-  end
-
   def method_names(*args)
     methods(*args).map { |name| name.to_s }
   end

railties/guides/source/active_support_core_extensions.textile

@@ -937,13 +937,7 @@ NOTE: Defined in +active_support/core_ext/module/delegation.rb+
 
 h4. Method Names
 
-The builtin methods +instance_methods+ and +methods+ return method names as strings or symbols depending on the Ruby version. Active Support defines +instance_method_names+ and +method_names+ to be equivalent to them, respectively, but always getting strings back.
-
-For example, +ActionView::Helpers::FormBuilder+ knows this array difference is going to work no matter the Ruby version:
-
-<ruby>
-self.field_helpers = (FormHelper.instance_method_names - ['form_for'])
-</ruby>
+The builtin method +methods+ returns method names as strings or symbols depending on the Ruby version. Active Support defines +method_names+ to be equivalent, but always getting strings back.
 
 NOTE: Defined in +active_support/core_ext/module/method_names.rb+