chore(last): add type guard overload
chore(last): add type guard overload

Closes #3717

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