dm constraints belongs_to "Can't create table 'dm_constraints.#sql-" bug

dm-constraints.rb

require 'bundler/setup'
Bundler.require :default

class List
  include DataMapper::Resource
  
  property :id, Serial
  property :name, String
  
  has n, :items, constraint: :destroy
end

class Item
  include DataMapper::Resource
  
  property :id, Serial
  property :name, String
  
  # uncomment this and run again
  # belongs_to :list
end

user = "root"
pass = ""

puts `mysql -u #{user} --password=#{pass} -e 'CREATE DATABASE IF NOT EXISTS dm_constraints'`
DataMapper::Logger.new($stdout, :debug)
DataMapper.setup :default, "mysql://#{user}:#{pass}@localhost/dm_constraints"

DataMapper.auto_migrate!

list = List.create( name: "a list" )
items = []
items << list.items.create( name: "item one")
items << list.items.create( name: "item two")
items << list.items.create( name: "item three")

list.destroy

puts Item.all

error.txt

# error: 

#  ~ Can't create table 'dm_constraints.#sql-10b_35' (errno: 150) (code: 1005, sql state: HY000, query: ALTER TABLE `items` ADD CONSTRAINT `items_list_fk` FOREIGN KEY (`list_id`) REFERENCES `lists` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION, uri: mysql:root:@localhost/dm_constraints)
#/Users/makevoid/.rvm/gems/ruby-1.9.3-p0/bundler/gems/dm-do-adapter-268302022ae8/lib/dm-do-adapter/adapter.rb:63:in `execute_non_query': Can't create table 'dm_constraints.#sql-10b_35' (errno: 150) (DataObjects::SQLError)


# my clue -  constraints gem:
# constraints/adapters/do_adapter:71
#
# execute(create_constraints_statement)

Gemfile

def github(gem)
  "git@github.com:datamapper/#{gem}"
end

def gh_gem(gem)
  gem gem, git: github(gem)
end

%w(dm-core dm-constraints dm-migrations dm-do-adapter dm-mysql-adapter).each do |g|
  gh_gem g
end