Animation
Which attributes a cue may move, and how each one travels between values.
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#The animatable surface
An attribute joins the animatable surface by declaring an interpolation kind — number, number-list, colour, point, interval, edges, or discrete for values that flip rather than blend. !cue.to refuses any attribute without one.
The surface grows deliberately, attribute by attribute. Declare a kind when animating the attribute means something on the surface, not because the type happens to be interpolable.