Templates do not resolve recursively

I am trying to create a template for my config file using confuse but have trouble understanding how this works. Unfortunately I can't find much about it in the docs.
I am have the following sample in `MyApp.py`:

```
import confuse

template = {"api": {"token_file": confuse.templates.Filename()}}

config = confuse.Configuration("MyApp")
config.get(template)
print(config["api"]["token_file"])
print(config["api"].get(template["api"])["token_file"])
print(config["api"]["token_file"].as_filename())
```

If I then put the following in `~/.config/MyApp/config.yaml`
```
api:
token_file: ./my_token.pickle
```

This is the output of MyApp.py:
```
./my_token.pickle
/home/me/.config/MyApp/my_token.pickle
/home/me/.config/MyApp/my_token.pickle
```
As you can see the first print statement doesn't actually resolve the filename, even though the template specifies it as a filename, but the second and third version do resolve it correctly. Since I want my application to be ignorant wrt confuse, I just want it to use `config['api']['token_file']` without having to worry about the templates. So is there a way to have confuse recursively resolve the template types when I call `config.get(template)`, so the first print statement also resolves as I was expecting?

Start with the example in MyApp.py and the ~/.config/MyApp/config.yaml configuration shown in the issue, then run the sample to compare config.get(template) with the nested lookups. Trace how confuse applies template types during config.get; done means config['api']['token_file'] resolves the relative filename without requiring callers to apply templates again.

Written by the indexing model from the issue text.