Serverless Stack

Hi, I am trying to set up a cache policy for CloudFront.  The cache policy requires having a unique name, so I need to “decorate” it with a stage name. So I try to use:
```cachePolicyName: scope.stageName + 'CFrontCachePolicy'```
where scope is `<http://sst.App|sst.App>` .

The problem is that `stageName` is empty. What is the reason for that?

Alternatively, you can do:
```cachePolicyName: scope.logicalPrefixedName("CFrontCachePolicy")```

btw, where did you see `scope.stageName`?

I’m asking b/c we should update the doc if it was mis-documented somewhere.

My IDE uses autocomplete so this is my first choice. Maybe some documentation in the code should be required.