TunerDevice: use Set instead of Array for _users collection
TunerDevice: use Set instead of Array for _users collection

Chinachu/Mirakurun,Chinachu/Mirakurun,kanreisa/Mirakurun,Chinachu/Mirakurun,kanreisa/Mirakurun,Chinachu/Mirakurun,kanreisa/Mirakurun