Indeed. I fixed it in git and eventually it will be put online as well.
I seriously don’t see where our sliders are posing any problem. Even not knowing that you don’t have to hit the triangle I would expect people to figure that out on their own after 5 minutes of using them. And being able to click into a slider to set its value instead of dragging the marker to that position is common among basically all slider implementations I know and not unique for ours.