Reproduction steps for ActiveRecord `touch` not clearing changes in `lock_version` when used with optimistic locking

repro.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", 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:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :hammers, force: true do |t|
    t.integer :lock_version
    t.timestamps
  end
end

class Hammer < ActiveRecord::Base
end

class TouchTest < Minitest::Test
  def test_touching_stuff
    hammer = Hammer.create!

    hammer.touch

    assert_equal 1, hammer.lock_version
    refute hammer.changed?, "Changes should be cleared: #{hammer.changes.inspect}"
  end
end