React key prop substitute!

I know what you're thinking, James, you silly sausage - Solid.js doesn't require keys for loops, and you're absolutely right but... I need key={} for another reason, I need to cause a component to be entirely unmounted and remounted, which was easily viable in React by just updating its key value in its parent. Any ideas how I can do that in Solid.js?

Cheers,
James