ActiveRecord::AttributeMethods#column_for_attribute doesn't work with alias_attribute and behaves strangely with nonexistent attribute

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 'sqlite3'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'minitest/autorun'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')

ActiveRecord::Schema.define do
  create_table :posts do |t|
    t.string :title
  end
end

class Post < ActiveRecord::Base
  alias_attribute :aliased_title, :title
end

class ColumnForAttributeTest < Minitest::Test
  def setup
    @post = Post.create! title: 'An awesome post'
    @real_column = @post.column_for_attribute(:title)
  end

  def test_aliased_attribute
    aliased_column     = @post.column_for_attribute(:aliased_title)

    p aliased_column.name #>> 'aliased_title' - there's no such column!
    p aliased_column.type #>> nil!

    assert_equal @real_column.name, aliased_column.name
    assert_equal @real_column.type, aliased_column.type
  end

  def test_nonexistent_attribute
    nonexistent_column = @post.column_for_attribute(:nonexistent)

    p nonexistent_column.name #>> 'nonexistent' - again no such column!
    p nonexistent_column.type #>> nil - seems reasonable

    # or some other way to tell us there's a problem
    assert_equal nil, nonexistent_column.name
  end
end