Mongoid Ambigious Relation Bug?

mongoid-ambiguous-relation-bug.rb

require 'rubygems'
require 'bundler/setup'
require 'mongoid'

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db("mongoid-test")
end

class Group
  include Mongoid::Document
  has_many :employees, class_name: 'Person', foreign_key: :employer_id
  has_many :subcontractors, class_name: 'Person', foreign_key: :client_id
end

class Person
  include Mongoid::Document
  belongs_to :employer, class_name: 'Group'
  belongs_to :client, class_name: 'Group' #, inverse_of: :subcontractors
end

a = Group.create!
b = Group.create!

person = Person.new(employer: a, client: b)
p person.employer == person.client # should be false
person.save!
person.reload

# this shows false on mongoid 2.4.8, true on mongoid 2.4.9
p person.employer == person.client # should be false