closing
The tension (as a positive float) applied on the ExpandableFab's icon to mimic an AnticipateInterpolator when it's playing its closing animations. An AnticipateInterpolator allows us to have a closing animation where the ExpandableFab's icon will begin rotating slightly backwards, before smoothly rotating forward to its default 0 degree rotation. Every multiple of 10f will be a full 360 degree rotation backwards. Default value is 2f.