Improve return type of `Node.cloneNode`

[Stadly]

Would it be possible to improve the return type of Node.cloneNode?

For example:

let svg: SVGElement;
const clone = svg.cloneNode(true);

I would expect the type of clone to be SVGElement, but it is in fact Node.

[Stadly]

There is an issue in the TypeScript repo, but very little activity lately: https://github.com/microsoft/TypeScript/issues/283