message: Fetch map keys, don't use Object.keys
diff: @@ -368,9 +368,8 @@ export class ClientPool {
  const domainList = Object.keys(this.virtualClients);
  const clientList: {[userId: string]: BridgedClient[]} = {};
  domainList.forEach((domain) => {
  - Object.keys(
  - this.virtualClients[domain].userIds
  - ).filter(
  + [...this.virtualClients[domain].userIds.keys()]
  + .filter(
  (u) => userIdRegex.exec(u) !== null
  ).forEach((userId: string) => {
  if (!clientList[userId]) {
  