YAML: fix parsing when key is f
YAML: fix parsing when key is f

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