import relative with unbundle from @rubygem scoped package fails

When in a @rubygems scoped package, this...

```
import ActiveModel from './store' with { unbundle: 'true' }
```

Results in this...

```
import ActiveModel from "/Users/joelmoss/dev/clients/harleytherapy/hue/lib/hue/active_model/store.js";
```

That is the full file system path, when It should be the URL path.