refactor(single): smaller impl
refactor(single): smaller impl

martinsik/rxjs,kwonoj/RxJS,martinsik/rxjs,ReactiveX/RxJS,benlesh/RxJS,kwonoj/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,benlesh/RxJS,benlesh/RxJS,kwonoj/RxJS,ReactiveX/RxJS,martinsik/rxjs,ReactiveX/rxjs,ReactiveX/rxjs,ReactiveX/RxJS,martinsik/rxjs,kwonoj/RxJS,ReactiveX/rxjs,benlesh/RxJS