class Grape::Router::Route

def params(input = nil)
  if input.nil?
    pattern.named_captures.keys.each_with_object(translator.params) do |(key), defaults|
      defaults[key] ||= '' unless FIXED_NAMED_CAPTURES.include?(key) || defaults.key?(key)
    end
  else
    parsed = pattern.params(input)
    parsed ? parsed.delete_if { |_, value| value.nil? }.symbolize_keys : {}
  end
end