message: refactor: remove unnecessary if statement.
diff: @@ -68,11 +68,9 @@ export function mergeInternals<T, R>(
  // Note that this call will increment `active` ahead of the
  // next conditional, if there were any more inner subscriptions
  // to start.
  - if (buffer.length) {
  while (buffer.length && active < concurrent) {
  doInnerSub(buffer.shift()!);
  }
  - }
  // Check to see if we can complete, and complete if so.
  checkComplete();
  }
  