I'm developing a game framework and I've just migrated to Pixi.js V3. After some bumps on the road - undocumented loader & interaction management changes - I've managed to put it in the working state.   However, one problem is pestering me: every time I press a mouse button on the sprite or container, or release it, two events are registered instead of one - two on the 'mousedown' and two on the 'mouseup'. This happens with left as well as with right mouse button. Now, I did not change anyth