There were some recent changes to the JSON format without accompanying
schema documentation changes [1, 2].  Though, curiously, [1] was
documented in the schema long before it was implemented owing to a
historical twist (we *used* to have Bcc in the JSON output and then it
got lost [my fault, most likely]).  Patches 2 and 3 try to increase
the visibility of the documentation; I'm open to better ways to do
this.

[1] id:7b1848a5828820912e3f7b960528b0dbc6a8b361.1347258748.git.mina86@mina86.com
[2] id:1351591967-17438-2-git-send-email-novalazy@gmail.com