Currently, we can explicitly name an existing user as the default for a ‘user’ field - like this:
fields: author: label: Author type: user default: john
However, the most common use-case is to actually have the field default to the currently logged-in user - that is: whoever is logged in is who is most likely to be writing the article, not an arbitrary user.
Unfortunately, there is no way to set such a default for a user field - it’s either leave it empty, or have an explicit user. What we need is to be able to do:
fields: author: label: Author type: user default: current