each_line problem in response.rb

Using thin-0.6.1-x86-mswin32-60 gem:

lib/thin/response.rb - lines 37-41

    def headers=(key_value_pairs)
      key_value_pairs.each do |k, vs|
        vs.each_line { |v| @headers[k] = v.chomp }
      end
    end

gives "Unexpected error while processing request: undefined method `each_line' for []:Array"

Reverting to "each" (from previous mswin32 gem) solves the problem.