message: API: Fix ExtractMongoId generic parameter default
diff: * @param from A mongoose object or ID string.
  * @param fallback Return this if no apparent ID is found.
  */
  -export function extractSingleMongoId<T>(from: any, fallback?: T): string | T {
  +export function extractSingleMongoId<T = undefined>(from: any, fallback?: T): string | T {
  if (typeof from === 'string' || from instanceof String) {
  return from.toString();
  } else if (from instanceof Object) {
  @@ -35,7 +35,7 @@ export function extractSingleMongoId<T>(from: any, fallback?: T): string | T {
  * @param from A mongoose object, ID string, or (possibly mixed) array of such.
  * @param fallback Return this if no apparent ID is found.
  */
  -export function extractMongoId<T>(from: any | any[], fallback?: T): string | T | (string | T)[] {
  +export function extractMongoId<T = undefined>(from: any | any[], fallback?: T): string | T | (string | T)[] {
  if (Array.isArray(from)) {
  const results: any[] = [];
  for (const value of from) {
  