calls dispatched as per multithreaded, but checked against singleton
calls dispatched as per multithreaded, but checked against singleton

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