message: Remove unnecessary branch from dedupExchange checking sub
diff: @@ -47,13 +47,10 @@ export const dedupExchange = (forward: IExchange): IExchange => {
  }
  return () => {
  - refCounter--;
  - if (refCounter === 0) {
  + if (--refCounter === 0) {
  delete inFlight[key];
  - if (subscription !== undefined) {
  subscription.unsubscribe();
  }
  - }
  };
  }));
  };
  