Array Extension Standalone

As referenced on the rails-core mailing list, doing a:

require 'activesupport/core_ext/array'

Does not require all the necessary components for all the extensions in activesupport to function correctly. This behaviour was tested on 2.3 and 3.0, yielding similar results:

irb(main):001:0> require 'active_support/array'
irb(main):002:0> [1].to_sentence
NameError: uninitialized constant Array::I18n

As you can see here, the array core extensions are not including I18n by default. Without it, to_sentence is broken.