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We now have everything in place to replace Tweener for all animatable properties with implicit animations, which has the following benefits: - they run entirely in C, while Tweener requires context switches to JS each frame - they are more reliable, as Tweener only detects when an animation is overwritten with another Tween, while Clutter considers any property change https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/22