charts.lines: add a test for y-in-bounds?
charts.lines: add a test for y-in-bounds?

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