Bug on globalize gem with dirty attributes

bug-report.rb

# frozen_string_literal: true

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails", "5.1.6"
  gem "sqlite3"
  gem "globalize", github: "globalize/globalize"
end

require "active_record"
require "minitest/autorun"
require "logger"

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)


class Post < ActiveRecord::Base
  translates :title

  attribute :title_en

  def title_en=(value)
    super(value)
    write_attribute(:title, value, :locale => I18n.locale)
  end

  def title_en
    globalize.fetch_stash(:en, :title) || globalize.fetch_attribute(:en, :title)
  end
end

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
  end
  reversible do |dir|
    dir.up do
      Post.create_translation_table! title: :string
    end
    dir.down do
      Post.drop_translation_table!
    end
  end
end


class BugTest < Minitest::Test
  def test_dirty_changes
    post = Post.create!(title_en: "v1")
    assert_equal "v1", post.title
    assert_equal [nil, "v1"], post.saved_changes[:title_en]

    post.reload
    assert_equal "v1", post.title
    assert_equal "v1", post.title_en
    assert post.update(title_en: "v2")
    assert_equal "v2", post.title
    assert_equal ["v1", "v2"], post.saved_changes[:title_en]
  end
end