Subscription file syntax is designed to minimize boiler-plate when authoring new subscriptions.
You can now unpack any subscription using the ``inspect`` sub-command to see its boiler-plate *preset format*.
```
ytdl-sub inspect --config /path/to/config.yaml --match "BBC News" /path/to/subscriptions.yaml
```
This can be utilized for numerous purposes including:
* Ensuring your custom preset is getting applied correctly.
* Figuring out which variables set things like file names, metadata, etc.
* Understanding how subscription syntax translates to preset representation.
The default ``--level`` of inspect will fill in defined variables. Using ``--level original`` will present the subscription's raw layout with no fill.
Expands variable validation to also include support for partial resolution.
In short, this will partially execute script code until it hits unresolved runtime variables, and store that as the new script representation. This functionality will allow for the upcoming `inspect` command, which will show users their script code in action without having to dry-run.
