db.tuples: use natural-sort in test case.
db.tuples: use natural-sort in test case.

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