Sequel error in macruby

gistfile1.txt

irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'sequel'
=> true
irb(main):003:0> DB = Sequel.sqlite
=> #<Sequel::SQLite::Database: "sqlite:/">
irb(main):004:0> DB.create_table :items do
irb(main):005:1>   primary_key :id
irb(main):006:1>   String      :title
irb(main):007:0> end
=> nil
irb(main):008:0> class Item < Sequel::Model
irb(main):009:0> end
=> nil
irb(main):010:0> item = Item.new
NameError: undefined local variable or method `model' for #<Item:0x200427d60>
	/Library/Frameworks/MacRuby.framework/Versions/0.10/usr/lib/ruby/Gems/1.9.2/gems/sequel-3.22.0/lib/sequel/model/base.rb:1378:in `set_restricted:'
	/Library/Frameworks/MacRuby.framework/Versions/0.10/usr/lib/ruby/Gems/1.9.2/gems/sequel-3.22.0/lib/sequel/model/base.rb:1064:in `set:'
	/Library/Frameworks/MacRuby.framework/Versions/0.10/usr/lib/ruby/Gems/1.9.2/gems/sequel-3.22.0/lib/sequel/model/base.rb:753:in `initialize'