Weird RSpec issue

gistfile3.txt

1)
'User should get all active users' FAILED
expected any? to return false, got true
./spec/models/user_spec.rb:26:

user.rb

# == Schema Information
#
# Table name: users
#
#  id         :integer         not null, primary key
#  active     :boolean
#  created_at :datetime
#  updated_at :datetime
#

class User < ActiveRecord::Base
  named_scope :active, :conditions => { :active => true }
end

user_spec.rb

require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')

Factory.define :active_user, :class => "User" do |f|
  f.active true
end

Factory.define :inactive_user, :class => "User" do |f|
  f.active false
end

describe User do

  it "should get all active users" do
    active   = Factory(:active_user)
    inactive = Factory(:inactive_user)

    subject  = User.active
    subject.should be_all(&:active)

    inverse = User.all - subject

    inverse.none?(&:active).should be_true
    inverse.any?(&:active).should be_false

    # inverse.should be_none(&:active)
    inverse.should_not be_any(&:active)
  end

end