Animating color gradient changes

[tiagopigatto]

First of all, congrats on building this lib, it's really useful! One use case that I came across was animating a color change from a gradient to another from a single node. I tried using this piece of code provided from previous questions, but this would only apply animation changes to flat colors:

func tint(_ node: SVGNode, color: SVGColor) {
        if let group = node as? SVGGroup {
            for content in group.contents {
                tint(content, color: color)
            }
        } else if let shape = node as? SVGShape {
            shape.fill = color
        }
    }

Is there a way to achieve this with the current state in which the framework is in?