class RSpec::Matchers::BuiltIn::ContainExactly

def convert_actual_to_an_array
  if actual.respond_to?(:to_ary)
    @actual = actual.to_ary
  elsif actual.respond_to?(:to_a) && !to_a_disallowed?(actual)
    @actual = actual.to_a
  else
    false
  end
end