Function invite_permitted 

fn invite_permitted(
    user_id: &UserId,
    room_id: &RoomId,
    filter: &InviteFilter,
    invite_state: &[Raw<AnyStrippedStateEvent>],
) -> bool

invite_permitted_room for a room whose stripped state is in hand.

Callers walking stored invites already hold the state and take this form, which spares them the load the room-keyed form pays per room. room_id names the affected row in the sender-less diagnostic and does not enter the verdict. That diagnostic stays at debug on a release build deliberately, since the condition repeats for every sync an affected user makes.