Nice! The only thing is that fields and variants don't actually require enabling options, but they are always None or not emitted when the options are not enabled.

Nice! The only thing is that fields and variants don't actually require enabling options, but they are always None or not emitted when the options are not enabled.

Yes, but if you don't enable them, you don't need to handle them, that is what I meant by that. But I'm happy to adjust that wording if you have a better one!

I would say something like 'Only relevant if this flag is enabled, always None otherwise (or 'Only triggered if this flag is enabled').

Used the wording "Only parsed and emitted with ....`

Great!, the only thing is the comment for metadata blocks, it seems that you forgot to update it.