exists? to support ids which are strings

[mtmail]

It's my understanding ActiveRecord supports ids which are strings (for example UUIDs).

Currently (version 4.0)

class Car < ActiveHash::Base
  self.data = [
    id: 'bmw', title: 'BMW'
  ]
end

Car.find('bmw').is_a?(Car)
 => true
Car.find_by(id: 'bmw').is_a?(Car)
 => true
Car.where(id: 'bmw').first.is_a?(Car)

Car.exists?('bmw')
 => false
Car.exists?(id: 'bmw')
 => true

I would've expected Car.exists?('bmw') to return true.

In active_hash/base.rb I see ids are converted to string in several places for comparison, and the record_index also stores the keys as string.