sequences.extras: fix stack effect for filter-all-subseqs.
sequences.extras: fix stack effect for filter-all-subseqs.

bpollack/factor,bpollack/factor,bpollack/factor,tgunr/factor,factor/factor,mrjbq7/factor,bpollack/factor,bpollack/factor,mrjbq7/factor,factor/factor,factor/factor,bpollack/factor,tgunr/factor,tgunr/factor,tgunr/factor,bpollack/factor,factor/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,factor/factor