ActiveRecord::SchemaDumper does not correctly dump UUID primary keys (when you use not uuid-ossp but pgcrypto)

pg_schema_dump_pkey_bug_test.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'rack', github: 'rack/rack'
    gem 'pg'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'active_support/all'
require 'minitest/autorun'
require 'logger'

ActiveRecord::Base.establish_connection(adapter: 'postgresql', database: 'test', user: 'postgres')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  enable_extension 'pgcrypto'
  drop_table :foos  if table_exists?(:foos)
  create_table :foos, id: :uuid, default: 'gen_random_uuid()'
end

class Foo < ActiveRecord::Base
end

class BugTest < Minitest::Test
  def test_association_stuff
    schema_io = StringIO.new
    ActiveRecord::SchemaDumper.dump(Foo.connection, schema_io)
    schema_io.seek(0)
    schema = schema_io.read

    assert_equal 'id',        Foo.connection.primary_key('foos')
    assert_equal ['id', nil], Foo.connection.pk_and_sequence_for('foos')
    assert_match /primary_key: true/, schema
  end
end