namespaces: simplify (box-at) using cache.
namespaces: simplify (box-at) using cache.

factor/factor,tgunr/factor,nicolas-p/factor,mrjbq7/factor,factor/factor,AlexIljin/factor,mrjbq7/factor,mrjbq7/factor,mrjbq7/factor,tgunr/factor,AlexIljin/factor,bpollack/factor,bjourne/factor,AlexIljin/factor,slavapestov/factor,bjourne/factor,slavapestov/factor,nicolas-p/factor,bjourne/factor,bjourne/factor,bpollack/factor,mrjbq7/factor,nicolas-p/factor,slavapestov/factor,bpollack/factor,slavapestov/factor,slavapestov/factor,nicolas-p/factor,bpollack/factor,factor/factor,mrjbq7/factor,factor/factor,AlexIljin/factor,tgunr/factor,tgunr/factor,nicolas-p/factor,bjourne/factor,factor/factor,nicolas-p/factor,bjourne/factor,bpollack/factor,bjourne/factor,factor/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,tgunr/factor,slavapestov/factor,nicolas-p/factor,AlexIljin/factor,slavapestov/factor