Debugging Kirk $stderr issue

config.ru

require 'rubygems'
require 'sinatra/base'
require 'kirk'
require 'ruby-debug'
run Sinatra.new {
  get '/' do
    # debugger
    $stdout.puts 'Testing $stdout!'
    $stderr.puts 'Testing $stderr!'
    'hi'
  end
}

# To run - Save this file as config.ru, and run: rackup -s Kirk