Problem with Ruby 1.9.x

In Ruby 1.9.x WillPaginate::Finder::ClassMethods#wp_count doesn't remove :include options in following code:

# forget about includes if they are irrelevant (Rails 2.1)
if count_options[:include] and
    klass.private_methods.include?('references_eager_loaded_tables?') and
    !klass.send(:references_eager_loaded_tables?, count_options)
  count_options.delete :include
end

klass.private_methods in ruby 1.8.x returns strings, in ruby 1.9.x returns symbols.

Oneline patch:

- klass.private_methods.include?('references_eager_loaded_tables?')
+ klass.private_methods.map { |n| n.to_sym }.include?(:references_eager_loaded_tables?)