class UserAgent::Version

def <=>(other)
  case other
  when Version
    if @comparable
      ([0]*6).zip(to_a, other.to_a).each do |dump, a, b|
        a ||= 0
        b ||= 0
        if a.is_a?(String) && b.is_a?(Integer)
          return -1
        elsif a.is_a?(Integer) && b.is_a?(String)
          return 1
        elsif a == b
          next
        else
          return a <=> b
        end
      end
      0
    elsif to_s == other.to_s
      return 0
    else
      return -1
    end
  when String, NilClass
    self <=> self.class.new(other)
  else
    nil
  end
end