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/// export
export function toString(type) {  switch(type) {    // https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-11    case 1: return "LLQ";    case 2: return "UL";    case 3: return "NSID";    case 5: return "DAU";    case 6: return "DHU";    case 7: return "N3U";    case 8: return "CLIENT_SUBNET";    case 9: return "EXPIRE";    case 10: return "COOKIE";    case 11: return "TCP_KEEPALIVE";    case 12: return "PADDING";    case 13: return "CHAIN";    case 14: return "KEY_TAG";    case 26946: return "DEVICEID";  }
  if (type < 0)    return null;
  return `OPTION_${type}`;}
export function toCode(name) {  if (typeof name === "number")    return name;
  if (!name)    return -1;
  switch(name.toUpperCase()) {    case "OPTION_0": return 0;    case "LLQ": return 1;    case "UL": return 2;    case "NSID": return 3;    case "OPTION_4": return 4;    case "DAU": return 5;    case "DHU": return 6;    case "N3U": return 7;    case "CLIENT_SUBNET": return 8;    case "EXPIRE": return 9;    case "COOKIE": return 10;    case "TCP_KEEPALIVE": return 11;    case "PADDING": return 12;    case "CHAIN": return 13;    case "KEY_TAG": return 14;    case "DEVICEID": return 26946;    case "OPTION_65535": return 65535;  }
  const m = name.match(/_(\d+)$/);
  if (m)    return parseInt(m[1], 10);
  return -1;}