ActiveSupport、Array#rand

>> require "rubygems"
=> true
>> require "active_support"
=> true
>> [1, 2, 3, 4, 5].rand
=> 4
>> [1, 2, 3, 4, 5].rand
=> 4
>> [1, 2, 3, 4, 5].rand
=> 1
>> [1, 2, 3, 4, 5].rand
=> 2
>> [1, 2, 3, 4, 5].rand
=> 1
>> [1, 2, 3, 4, 5].rand
=> 1
>> [1, 2, 3, 4, 5].rand
=> 4
>> [1, 2, 3, 4, 5].rand
=> 1

そういえば、Array#shuffle はないんだっけ？？？