def join_special_params
      # some params use comma-joined strings instead of query-based arrays for multiple values
      @options.each do |k, v|
        if SPECIALLY_JOINED_PARAMS.include?(k.to_sym) && v.is_a?(Array)
          @options[k] = v.join(',')
        end
      end
    end
def join_special_params
      # some params use comma-joined strings instead of query-based arrays for multiple values
      @options.each do |k, v|
        if SPECIALLY_JOINED_PARAMS.include?(k.to_sym) && v.is_a?(Array)
          @options[k] = v.join(',')
        end
      end
    end
Initialize