Expired session is not empty.

I need to check session is empty. After session expired, using console.log of session returns {}. But when I try Object.keys(session).length, it's not 0 even there's no property in the session.

So I try print session directly and now it shows me like this:

```javascript
console.log('Session: ', context.session); // {}
console.log('Keys: ' + Object.keys(context.session)); // _sessCtx,_ctx,isNew
```

How do I guarantee that session is expired and it's empty?

Start by reproducing the reported behavior around context.session after expiration, comparing console.log(session) with Object.keys(session). The issue names no source file or test; done would require establishing whether the expired session is correctly detectable and empty, then documenting or correcting the observed behavior.

Written by the indexing model from the issue text.