hunk.code_window:       ));
       const send = () => {
         if (hasValue) {
           subscriber.next(sendValue!);
           !isComplete && startThrottle(sendValue!);
         }
  
hunk.labels: keep keep keep keep replace replace keep
hunk.after_edit:         // Ensure we clear out our value and hasValue flag
           // before we emit, otherwise reentrant code can cause
           // issues here.
           hasValue = false;
           const value = sendValue!;
           sendValue = null;
           // Emit the value.
           subscriber.next(value);
           !isComplete && startThrottle(value);
  
hunk.file_path: src/internal/operators/throttle.ts
hunk.type: replace
file: 
  import { mergeAll } from './mergeAll';
  import { OperatorFunction, ObservableInput, ObservedValueOf } from '../types';
  
  export function concatAll<T>(): OperatorFunction<ObservableInput<T>, T>;
  export function concatAll<R>(): OperatorFunction<any, R>;
  
  /**
   * Converts a higher-order Observable into a first-order Observable by
   * concatenating the inner Observables in order.
   *
   * <span class="informal">Flattens an Observable-of-Observables by putting one
   * inner Observable after the other.</span>
   *
   * ![](concatAll.svg)
   *
   * Joins every Observable emitted by the source (a higher-order Observable), in
   * a serial fashion. It subscribes to each inner Observable only after the
   * previous inner Observable has completed, and merges all of their values into
   * the returned observable.
   *
   * __Warning:__ If the source Observable emits Observables quickly and
   * endlessly, and the inner Observables it emits generally complete slower than
   * the source emits, you can run into memory issues as the incoming Observables
   * collect in an unbounded buffer.
   *
   * Note: `concatAll` is equivalent to `mergeAll` with concurrency parameter set
   * to `1`.
   *
   * ## Example
   *
   * For each click event, tick every second from 0 to 3, with no concurrency
   * ```ts
   * import { fromEvent, interval } from 'rxjs';
   * import { map, take, concatAll } from 'rxjs/operators';
   *
   * const clicks = fromEvent(document, 'click');
   * const higherOrder = clicks.pipe(
   *   map(ev => interval(1000).pipe(take(4))),
   * );
   * const firstOrder = higherOrder.pipe(concatAll());
   * firstOrder.subscribe(x => console.log(x));
   *
   * // Results in the following:
   * // (results are not concurrent)
   * // For every click on the "document" it will emit values 0 to 3 spaced
   * // on a 1000ms interval
   * // one click = 1000ms-> 0 -1000ms-> 1 -1000ms-> 2 -1000ms-> 3
   * ```
   *
   * @see {@link combineAll}
   * @see {@link concat}
   * @see {@link concatMap}
   * @see {@link concatMapTo}
   * @see {@link exhaust}
   * @see {@link mergeAll}
   * @see {@link switchAll}
   * @see {@link switchMap}
   * @see {@link zipAll}
   *
   * @return {Observable} An Observable emitting values from all the inner
   * Observables concatenated.
   */
  export function concatAll<O extends ObservableInput<any>>(): OperatorFunction<O, ObservedValueOf<O>> {
    return mergeAll(1);
  }
  