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export function appendMap<T>(body: URLSearchParams, prefix: string, raw: {[k:string]:T | null | undefined}, {  keyName = '.key',  valName = '.value',  entryPrefix,  appender,  encoder = String,}: {  keyName?: string;  valName?: string;  entryPrefix: string;  appender?: (body: URLSearchParams, prefix: string, val: T) => void;  encoder?: (val: T) => string;}) {  const entries = Object.entries(raw ?? {});  if (entries.length === 0) {    return body.append(prefix, '');  }  entries.forEach(([key, val], idx) => {    body.append(prefix+entryPrefix+String(idx+1)+keyName, key);    if (val == null) {      // TODO: do we want to emit this?    } else if (appender) {      appender(body, prefix+entryPrefix+String(idx+1)+valName, val);    } else {      body.append(prefix+entryPrefix+String(idx+1)+valName, encoder(val));    }  });}
export function appendList<T>(body: URLSearchParams, prefix: string, raw: T[], {  entryPrefix,  appender,  encoder = String,}: {  entryPrefix: string;  appender?: (body: URLSearchParams, prefix: string, val: T) => void;  encoder?: (val: T) => string;}) {  const entries = raw ?? [];  if (entries.length === 0) {    return body.append(prefix, '');  }  entries.forEach(appender    ? (member, idx) => {        appender(body, prefix+entryPrefix+String(idx+1), member);      }    : (member, idx) => {        body.append(prefix+entryPrefix+String(idx+1), encoder(member));      });}
// TODO?: check/warn for accidental millisecond inputexport function encodeDate_iso8601(input?: Date | number | null): string {  if (!input) return '';  const date = (typeof input === 'number') ? new Date(input*1000) : input;  return date.toISOString().replace(/\.000Z$/, 'Z');}export function encodeDate_unixTimestamp(input?: Date | number | null): string {  if (!input) return '';  if (typeof input === 'number') return input.toString();  return (input.valueOf() / 1000).toString();}// also rfc822 (toUTCString)