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
ClutterInterval.compute_value() computes the new value given a progress and copies it to a given GValue. Since most of the time we want to pass that very same value to another function that copies it again, we should have a compute_value() variant that stores that computed value inside ClutterInterval and returns a pointer to it. This way we initialize the result GValue just once and we never copy it, as long as the Interval instance is valid.