This confuses me. I see three conditions in the table. If only `jwt` or `variables` is required, why even have a `default`?

[mjang]

This confuses me. I see three conditions in the table. If only jwt or variables is required, why even have a default?

Originally posted by @mjang in #730 (comment)

[mjang]

As noted by @AlexFenlon , this section was authored by @pdabelf5 .