Type Test is not assignable to type Record<string | number | symbol, unknown> Index signature for type string is missing in type Test

I created a small repro for my problem here: #854 

I wanted to use route-model-binding with resources I get from my API. I have Typescript interfaces for all of my resources. But the `route` helper does not accept the object because the "Index signature for type string is missing".

Do you know a solution for this? It's the latest version of ziggy (2.5.3)