Proposal to improve /createRoom

[turt2live]

Documentation: https://docs.google.com/document/d/1HM5ANCyrqXVGVLERzZkYI_3x2_KpYYmtWZXnFdIV66k/edit?usp=sharing
PRs: #1326
Related: https://github.com/matrix-org/matrix-doc/issues/1331

[turt2live]

@Half-Shot and @jcgruenhage please be aware that the scope of this proposal has changed. Pinging because you've thumbed-up it so far.

[jcgruenhage]

@turt2live I'd still say it's fine.

[Half-Shot]

I've got no issues with it either

[jcgruenhage]

Actually, no, I don't think we need to require a state key here, defaulting to an empty state key here feels better. While the presence of a state key makes a state event, this API is supposed to build state events, so it is implied to exist. Given that https://matrix.org/docs/spec/client_server/r0.3.0.html#put-matrix-client-r0-rooms-roomid-state-eventtype-statekey says The state_key for the state to send. Defaults to the empty string. I think that defaulting to an empty state key is fine.

[turt2live]

(note: we're arguing about this actively in #matrix-spec, proposal may be updated further)