ActiveSupport 3 doesn't autoload core extensions

Update: In fact it seems none of ActiveSupport's core extensions are autoloaded anymore. Is that intentional?

If so, it would seem unwise. There's a plethora of libraries out there which depend on those core extensions. I just ran into another related issue where requiring ActiveMerchant fails because it depends on the existence of HashWithIndifferentAccess.

require 'rubygems'
require 'active_support'
class Person
  cattr_accessor :type
end

results in:

NoMethodError: undefined method 'cattr_accessor' for Person:Class from (irb):4

The old (and deprecated) loading method of "require 'activesupport'" works just fine though:

require 'rubygems'
require 'activesupport'
class Person
  cattr_accessor :type
end

This raises no error and works as expected.