math.intervals.tests: clean up literal syntax
math.intervals.tests: clean up literal syntax

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