Should `absolute_path` expand tildes?

I was trying to do something like the following:

```just
export KUBECONFIG := if path_exists("~/.kube/config") != "true" {
invocation_directory() / ".kubeconfig"
} else {
absolute_path("~/.kube/config")
}
```

but that results in a `$KUBECONFIG` of literally '~/.kube/config' which doesn't work.

---

I also just realized as I was typing this up, that `path_exists` doesn't expand the tilde either. Should there be a different function instead, used to expand the tilde syntax?