Which pieces of information to include:
- blockinfo
- Tags if the current user is blocked, by whom, and for what reason.
- hasmsg
- Adds a tag "message" if the current user has pending messages.
- groups
- Lists all the groups the current user belongs to.
- implicitgroups
- Lists all the groups the current user is automatically a member of.
- rights
- Lists all the rights the current user has.
- changeablegroups
- Lists the groups the current user can add to and remove from.
- options
- Lists all preferences the current user has set.
- preferencestoken
- DEPRECATED! Get a token to change current user's preferences.
- editcount
- Adds the current user's edit count.
- ratelimits
- Lists all rate limits applying to the current user.
- realname
- Adds the user's real name.
- Adds the user's email address and email authentication date.
- acceptlang
- Echoes the Accept-Language header sent by the client in a structured format.
- registrationdate
- Adds the user's registration date.
- unreadcount
- Adds the count of unread pages on the user's watchlist (maximum $1; returns "$2" if more).
