Test fails on store_accessor dup

test_hstore_accessor_dup.rb

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'minitest/autorun'
require 'logger'

ActiveRecord::Base.logger = Logger.new(STDOUT)

class Contact < ActiveRecord::Base
  store_accessor :properties, :name, :phone
end

class BugTest < Minitest::Unit::TestCase
  def test_hstore_accessor
    p = Contact.new(name: 'Bob', phone: '123')
    p2 = p.dup

    assert_equal("Bob", p.name) #PASS
    assert_equal("123", p.phone) #PASS
    assert_equal("Bob", p2.name) #FAIL
    assert_equal("123", p2.phone) #FAIL
  end
end

p2.name, p2.phone => nil