present_collection issue

Hello,

Reading http://www.rubydoc.info/github/intridea/grape-entity/Grape%2FEntity.present_collection and I think there might be a bug in documentation.
Definition

class Users < Grape::Entity
      present_collection true
      expose :items, as: 'users', using: API::Entities::Users
end

Usage

module API
  class Users < Grape::API
    version 'v2'

    # this will render { "users" : [ { "id" : "1" }, { "id" : "2" } ], "version" : "v2" }
    get '/users' do
      @users = User.all
      present @users, with: API::Entities::Users
    end
end

Shouldn't expose :items, as: 'users', using: API::Entities::Users have singular class name?
Now I get stack level too deep error, but when I change from Users to User, it returns null.
Please advise. Thank you

My code:

api/events.rb

desc 'Recently booked'
get 'recently_booked' do
  events = Event.active
  present events, with: API::Entities::Events
end

api/entities/events.rb

module API
  module Entities
    class Events < Grape::Entity
      present_collection true

      expose :location
      expose :events, using: API::Entities::Events
    end
  end
end

Ruby: 2.3.0
Rails: 4.2.5.1
Gems: 2.5.1
$ bundle | grep 'grape'
Using grape-entity 0.4.8
Using grape 0.14.0
Using grape-swagger 0.10.4
Using grape-kaminari 0.1.8

Start with api/events.rb and api/entities/events.rb, then read the present_collection and expose behavior used by Grape::Entity. Reproduce the recently_booked endpoint with the shown Events entity and compare the recursive Users/Events examples. Done means the collection declaration and entity class naming are clarified, with the stack overflow and null response behavior accounted for.