ar_fixture: BigDecimal and YAML problem

When we used ar_fixture plugin, we found bug with BigDecimal. When we called Amount.to_fixture, this record was generated:

amount_03246: 
  deleted_at: 
  id: 3246
  value: !ruby/object:BigDecimal {}
  currency: 203

classic to_yaml on Amount class works fine. So I think that problem was violated by merging hash or some other magic ;-) in to_fixture method

Solution is easy (similiar as BigDecimal and YAML don't get along): in ar_fixture.rb override BigDecimal.to_yaml method like this:

class BigDecimal
  alias :_original_to_yaml :to_yaml
  def to_yaml (opts={},&block)
    to_s.to_yaml(opts,&block)
  end
end