Rails 5.0.0.beta4 creates references, polymorphic => true id/type columns in reverse order

0_references_polymorphic_out_of_order.rb

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'
  gem 'rails', '~>4.2.0'
  # gem 'rails', github: 'rails/rails'
  gem 'sqlite3'
end

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

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
logger = Logger.new(STDOUT)
logger.level = 1
ActiveRecord::Base.logger = logger

ActiveRecord::Schema.define do
  create_table :posts, force: true  do |t|
  end

  create_table :comments, force: true  do |t|
    t.references :resource, :polymorphic => true
  end
end

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post
end

puts "Rails version: " + Rails.version
ActiveRecord::SchemaDumper.dump

4.1.15_output.log

Rails version: 4.1.15
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: true do |t|
    t.integer "resource_id"
    t.string  "resource_type"
  end

  create_table "posts", force: true do |t|
  end

end

4.2.6_output.log

Rails version: 4.2.6
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: :cascade do |t|
    t.integer "resource_id"
    t.string  "resource_type"
  end

  create_table "posts", force: :cascade do |t|
  end

end
Run options: --seed 19035

# Running:

5.0.0.beta4_output.log

Rails version: 5.0.0.beta4
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.

ActiveRecord::Schema.define(version: 0) do

  create_table "comments", force: :cascade do |t|
    t.string  "resource_type"
    t.integer "resource_id"
    t.index ["resource_type", "resource_id"], name: "index_comments_on_resource_type_and_resource_id"
  end

  create_table "posts", force: :cascade do |t|
  end

end