memoize: faster memoize for single argument words.
memoize: faster memoize for single argument words.

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